1 Electricity Section 1 Section 1: Electric Charge and Force Preview Key Ideas Bellringer Electric Charge Transfer of Electric Charge Induced Charges Charging by Contact Electric Force Electric Field Lines
2 Electricity Section 1 Key Ideas What are the different kinds of electric charge? How do materials become charged when rubbed together? What force is responsible for most everyday forces?
3 Electricity Section 1 Bellringer 1. Name at least five examples of static electricity that occur in everyday life. 2. Fabric softeners are commonly used because they eliminate static cling. Explain why clothes in the dryer get static cling. 3. Why can walking across a carpeted room be a shocking experience. 4. Magnets have both north and south poles. While like poles repel each other, opposite poles attract each other. Explain the parallelism between magnetism and electric charge.
4 Electricity Section 1 Electric Charge What are the different kinds of electric charge? An object can have a negative charge, a positive charge, or no charge at all. Electric charge: an electrical property of matter that creates electric and magnetic forces and interactions
5 Electricity Section 1 Electric Charge, continued Like energy, electric charge is never created or destroyed. Like charges repel, and opposite charges attract. Electric charge depends on the imbalance of protons and electrons. Electrons are negatively charged. Protons are positively charged. Neutrons are neutral (no charge). Negatively charged objects have more electrons than protons. Positively charged objects have fewer electrons than protons.
6 Electricity Section 1 Visual Concept: Electric Charge
7 Electricity Section 1 Electric Charge, continued The SI unit of electric charge is the coulomb, C. A proton has a charge of C. An electron has a charge of C. The amount of electric charge on an object depends on the number of protons and electrons. The net electric charge of a charged object is always a multiple of C.
8 Electricity Section 1 Visual Concept: Characteristics of Electric Charge
9 Electricity Section 1 Transfer of Electric Charge How do materials become charged when rubbed together? When different materials are rubbed together, electrons can be transferred from one material to the other. The direction in which the electrons are transferred depends on the materials.
10 Electricity Section 1 Transfer of Electric Charge, continued Conductors allow charges to flow; insulators do not. electrical conductor: a material in which charges can move freely electrical insulator: a material in which charges cannot move freely Charges can move within uncharged objects. The charges in a neutral conductor can be redistributed without changing the overall charge of the object. Although the total charge on the conductor will be zero, the opposite sides can have an induced charge.
11 Electricity Section 1 Visual Concept: Electrical Conductors and Insulators
12 Electricity Section 1 Induced Charges A negatively charged rod brought near a metal doorknob induces a positive charge on the side of the doorknob closest to the rod and a negative charge on the side farthest from the rod.
13 Electricity Section 1 Transfer of Electric Charge, continued Objects can be charged by contact. The transfer of electrons from one object to another can charge objects. Objects charged by touching a charged object to a neutral object are said to be charged by contact. Objects can be charged by friction. Charging by friction occurs when one material gains electrons and becomes negatively charged, and the other loses electrons and becomes positively charged. Your clothes are charged by friction as they rub against each other inside the dryer, and stick together because of static electricity.
14 Electricity Section 1 Charging by Contact When a negative rod touches a neutral doorknob, electrons move from the rod to the doorknob. The transfer of electrons to the metal doorknob gives the doorknob a net negative charge.
15 Electricity Section 1 Visual Concept: Charging by Contact
16 Electricity Section 1 Transfer of Electric Charge, continued A surface charge can be induced on insulators. When a charged object is brought near an insulator, the positions of the electrons within the individual molecules of the insulator change slightly. One side of a molecule will be slightly more positive or negative than the other side. The molecules are polarized.
17 Electricity Section 1 Electric Force What force is responsible for most everyday forces? The electric force at the atomic and molecular levels is responsible for most of the everyday forces that we observe, such as the force of a spring and the force of friction. electric force: the force of attraction or repulsion on a charged particle that is due to an electric field
18 Electricity Section 1 Electric Force, continued The electric force is also responsible for effects that we cannot see. Bonding of atoms to form molecules is also due to the electric force. Electric force depends on charge and distance. The electric force between two objects is proportional to the product of the charges on the objects. The electric force is inversely proportional to the square of the distance between two objects.
19 Electricity Section 1 Electric Force, continued Electric force acts through a field. electric field: the space around a charged object in which another charged object experiences an electric force One way to show an electric field is by drawing electric field lines. Electric field lines point in the direction of the electric force on a positive charge.
20 Electricity Section 1 Electric Field Lines The electric field lines around a positive charge point outward. The electric field lines around a negative charge point inward.
21 Electricity Section 1 Electric Force, continued Electric field lines never cross one another. The field lines near two like charges point away from each other, and show that the charges repel each other. Field lines show both the direction of an electric field and the relative strength due to a given charge. More lines are drawn for greater charges to indicate greater force.
22 Electricity Section 1 Electric Field Lines Two positive charges repel each other. The positive charge is twice as large as the negative charge.
23 Electricity Section 1 Visual Concept: Electric Fields and Test Charges
24 Electricity Section 2 Section 2: Current Preview Key Ideas Bellringer Voltage and Current Electrical Potential Energy Electrical Potential Energy and Relative Position Battery Electric Cell Electrical Resistance Math Skills
25 Electricity Section 2 Key Ideas How are electrical potential energy and gravitational potential energy similar? What causes electrical resistance?
26 Electricity Section 2 Bellringer 1. Dry cell batteries are a source of mobile electrical power. Name five devices that use dry cell batteries. 2. Give reasons why copper is normally used to wire a home for electricity. 3. Why do you think it is important to unplug a device by pulling the plug instead of by yanking the plug out of the socket by pulling on the electrical cord? 4. Why are electrical appliances, such as razors, hair dryers, and curling irons, not to be used in the bathtub or shower?
27 Electricity Section 2 Voltage and Current How are electrical potential energy and gravitational potential energy similar? Just as a ball will roll downhill, a negative charge will move away from another negative charge. electrical potential energy: the ability to move an electric charge from one point to another
28 Electricity Section 2 Voltage and Current, continued The potential energy of an electric charge depends on its position in an electric field. The electrical potential energy of a moving charge decreases because the electric field does work on the charge.
29 Electricity Section 2 Electrical Potential Energy The electrical potential energy between two negative charges decreases as the distance between them increases.
30 Electricity Section 2 Voltage and Current, continued Potential difference is measured in volts. potential difference: the voltage difference in potential between two points in a circuit For a repulsive force electrical potential energy increases as the charges move closer to each other. The volt, V, is equivalent to one joule per coulomb (1 J/C). Potential difference is often called voltage.
31 Electricity Section 2 Electrical Potential Energy and Relative Position
32 Electricity Section 2 Visual Concept: Electrical Potential Energy
35 Electricity Section 2 Voltage and Current, continued There is a voltage across the terminals of a battery. cell: a device that produces an electric current by converting chemical or radiant energy into electrical energy One terminal, or end, is positive, and the other is negative. Batteries convert chemical energy into electrical energy.
36 Electricity Section 2 Battery
37 Electricity Section 2 Electric Cell
38 Electricity Section 2 Voltage and Current, continued A voltage sets charges in motion. Current is the rate of charge movement. electric current: the rate at which charges pass through a given point The SI unit of current is the ampere, A. 1 amp = 1 C/s
39 Electricity Section 2 Voltage and Current, continued In a direct current source the charges always move from one terminal to the other in the same direction. example: battery Conventional current is the current made of positive charge that would have the same effect as the actual motion of charge in the material. The direction of current is opposite to the direction that electrons move.
40 Electricity Section 2 Visual Concept: Comparing Direct and Alternating Current
41 Electricity Section 2 Visual Concept: Conventional Current
42 Electricity Section 2 Electrical Resistance What causes electrical resistance? Resistance is caused by internal friction, which slows the movement of charges through a conducting material. resistance: the opposition presented to the current by a material or device
43 Electricity Section 2 Electrical Resistance, continued Resistance can be calculated if current and voltage are known. A conductor s resistance indicates how much the motion of charges within it is resisted because of collisions of electrons with atoms. Ohms law: voltage resistance = R = current The SI unit of resistance is the ohm (Ω). 1 Ω = 1 V/A A resistor is a special type of conductor used to control current. V I
44 Electricity Section 2 Math Skills Resistance The headlights of a typical car are powered by a 12 V battery. What is the resistance of the headlights if they draw 3.0 A of current when turned on? 1. List the given and unknown values. Given: current, I = 3.0 A voltage, V = 12 V Unknown: resistance, R =? Ω
45 Electricity Section 2 Math Skills, continued 2. Write the equation for resistance. voltage resistance = R = current V I 3. Insert the known values into the equation, and solve. = V = 12 V R I 3.0 A R = 4.0
46 Electricity Section 2 Electrical Resistance, continued Conductors have low resistances. Insulators have high resistances. Semiconductors conduct under certain conditions. semiconductors: materials that have electrical properties between those of insulators and conductors Some materials can become superconductors. Some metals and compounds have zero resistance when their temperature falls below the critical temperature. Once a current is established in a superconductor, the current continues even if the applied voltage is removed.
47 Electricity Section 3 Section 3: Circuits Preview Key Ideas Bellringer What Are Circuits? Electric Circuit Series and Parallel Circuits Series and Parallel Electric Power and Electrical Energy Equation for Electric Power Math Skills Fuses and Circuit Breakers
48 Electricity Section 3 Key Ideas What is a closed circuit? What are the two ways that devices can be connected in a circuit? What happens to the energy that charges have in a circuit? Why is an overloaded circuit dangerous?
49 Electricity Section 3 Bellringer 1. Inexpensive electrical power is essential. List at least ten electrical devices that you have used today. 2. In some strings of Christmas lights, none of the lights work if one light is burned out. What is a possible explanation for this? 3. A big feast is being prepared in a home. The cooks are using a turkey roaster, the oven, an electric mixer, a blender, and a toaster. Every light is on and so is the refrigerator. All at once the power in the kitchen goes out. What is an explanation for this, and how can it be corrected?
50 Electricity Section 3 What Are Circuits? What is a closed circuit? The conducting path produced when a load, such as a string of light bulbs, is connected across a source of voltage is called a closed circuit. electric circuit: a set of electrical components connected such that they provide one or more complete paths for the movement of charges
51 Electricity Section 3 What Are Circuits?, continued The voltage source, whether a battery or an outlet, is always part of the conducting path of a closed circuit. Without a complete path and a source of voltage, there is no charge flow and therefore no current. This is called an open circuit.
52 Electricity Section 3 Electric Circuit
53 Electricity Section 3 What Are Circuits?, continued Switches interrupt the flow of charges in a circuit. You can use a switch to open and close a circuit. Schematic diagrams are used to represent circuits. schematic diagram: a graphical representation of a circuit that uses lines to represent wires and different symbols to represent components All electrical devices can be described by schematic diagrams. Schematic diagrams use standard symbols.
54 Electricity Section 3 Visual Concept: Schematic Diagram and Common Symbols
55 Electricity Section 3 Series and Parallel Circuits What are the two ways that devices can be connected in a circuit? Electrical devices can be connected as a series circuit so that the voltage is divided among the devices. They can also be connected as a parallel circuit so that the voltage is the same across each device. series circuit: a circuit in which the parts are joined one after another such that the current in each part is the same parallel circuit: a circuit in which the parts are joined in branches such that the potential difference across each part is the same
56 Electricity Section 3 Series and Parallel Circuits, continued Series circuits have a single path for current. When appliances or other devices are connected in a series circuit, they form a single pathway for charges to flow. The current in each device is the same. The resistances may be different. The voltage across each device in a series circuit can be different. If one element along the path in a series circuit is removed, the circuit will not work.
57 Electricity Section 3 Visual Concept: Resistors in Series
58 Electricity Section 3 Series and Parallel Circuits, continued Parallel circuits have multiple paths for current. The voltage across each device is the same. The current in each device does not have to be the same. The sum of the currents in all of the devices equals the total current. A break in any one path in a parallel circuit does not interrupt the flow of electric charge in the other paths.
59 Electricity Section 3 Visual Concept: Resistors in Parallel
60 Electricity Section 3 Series and Parallel When light bulbs are connected in series, charges must pass through both light bulbs to complete the circuit. When light bulbs are connected in parallel, charges have more than one path to follow. The circuit can be complete even if one light bulb burns out.
61 Electricity Section 3 Electric Power and Electrical Energy What happens to the energy that charges have in a circuit? Some of this energy is transformed into useful work, such as the turning of a motor, and some is lost as heat. electrical power: the rate at which electrical energy is converted into other forms of energy
62 Electricity Section 3 Electric Power and Electrical Energy, continued Electric power is calculated by multiplying the total current, I, by the voltage, V, in a circuit. power current voltage P = IV The SI unit for power is the watt (W). 1 W = 1 A 1 V
63 Electricity Section 3 Electric Power and Electrical Energy, continued If you combine the electric power equation with the resistance equation, V = IR, you can calculate the power lost, or dissipated, by a resistor. P = I R = R 2 V Electric companies measure energy in kilowatt-hours. One kilowatt-hour is the energy delivered in 1 h at the rate of 1 kw. 1 kw h = J 2
64 Electricity Section 3 Equation for Electric Power
65 Electricity Section 3 Math Skills Electric Power When a hair dryer is plugged into a 120 V outlet, the hair dryer has a 9.1 A current in it. What is the hair dryer s power rating? 1.List the given and unknown values. Given: voltage, V = 120 V current, I = 9.1 A Unknown: electric power, P =? W
66 Electricity Section 3 Math Skills, continued 2. Write the equation for electric power. power = current voltage P = IV 3. Insert the known values into the equation, and solve. P = (9.1 A)(120 V) P = W
67 Electricity Section 3 Fuses and Circuit Breakers Why is an overloaded circuit dangerous? The high currents in overloaded circuits can cause fires. When electrical wires carry more than a safe level of current, the circuit is said to be overloaded.
68 Electricity Section 3 Fuses and Circuit Breakers If a wire s insulation wears down, two wires may touch and create an alternative pathway for current, or a short circuit. Fuses melt to prevent circuit overloads. fuse: an electrical device that contains a metal strip that melts when current in the circuit becomes too great
69 Electricity Section 3 Fuses and Circuit Breakers Circuit breakers open circuits with high current. circuit breaker: a switch that opens a circuit automatically when the current exceeds a certain value The circuit breaker acts as a switch. Unlike fuses, circuit breakers can be reset by turning the switch back on.
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