Ohm s Law and Electronic Circuits

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1 Production Ohm s Law and Electronic Circuits Page 1 - Cyber Security Class

2 ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison Page 2 - Cyber Security Class

3 Ohm s Law I = V / R I = Current (Amperes) (amps) V = Voltage (Volts) R = Resistance (ohms) Georg Simon Ohm ( ) Page 3 - Cyber Security Class

4 Ohm s Law Ohm s Law explains the relationship between voltage (V or E), current (I) and resistance (R) The amount of current in a circuit is dependent on its resistance and the applied voltage. Specifically I = V/R If you know any two of the factors V, I, and R you can calculate the third. Current I = V/R Voltage V = IR Resistance R = V/I Page 4 - Cyber Security Class

5 1 ampere = 1 coulomb per second Page 5 - Cyber Security Class

6 Chart Page 6 - Cyber Security Class

7 VOLTAGE (V) It is the push or pressure behind current flow through a circuit, and is measured in (V) volts. Page 7 - Cyber Security Class

8 CURRENT Current refers to the quantity/volume of electrical flow. Measured in Amps (A) The symbol for current is I (for intensity) and is measured in amperes Page 8 - Cyber Security Class

9 RESISTANCE Resistance to the flow of the current. Measured in Ohms Opposition to the flow of current is termed resistance. The fact that a wire can become hot from the flow of current is evidence of resistance. Conductors have very little resistance. Insulators have large amounts of resistance. Page 9 - Cyber Security Class

10 Ohm s Law Page 10 - Cyber Security Class

11 Trick to Remember Ohm s Law VE V = Voltage = Volts I = Amperes = Amps I R R = Resistance = Ohms Ω Page 11 - Cyber Security Class

12 Trick to Remember Ohm s Law V V=I*R R = V I I R I = V R Page 12 - Cyber Security Class

13 How do calculate Current? Voltage is 5V V Resistance is 220 Ω Current = Amp? I R V 5 I = R I = 220 I = ma Amp Page 13 - Cyber Security Class

14 How do calculate Resistance? Voltage is 5V V Current is 10mA Resistance = Ohm? I R V 5 R = I R =.010amp R = 500 Ω Page 14 - Cyber Security Class

15 How do calculate Voltage? Resistance is KΩ Ω V Current is 200 ma Voltage = V? I R V=I*R V=.2*1KΩ V = 200v Page 15 - Cyber Security Class

16 Would This Work? Page 16 - Cyber Security Class

17 Would This Work? Page 17 - Cyber Security Class

18 Would This Work? Page 18 - Cyber Security Class

19 The Central Concept: Closed Circuit Page 19 - Cyber Security Class

20 circuit diagram Scientists usually draw electric circuits using symbols; cell lamp switch wires Page 20 - Cyber Security Class

21 Current is Directly Proportional to Voltage for a Constant Resistance OHM s LAW Page 21 - Cyber Security Class

22 Current is Inversely Proportional to Resistance for a Constant Voltage OHM s LAW Page 22 - Cyber Security Class

23 measuring voltage Set the DMM to Ω (to measure Resistance) Set it to the closest value above the target resistor you are measuring + - SERIES CIRCUIT Red lead Black lead This is how we measure volts in a circuit Page 23 - Cyber Security Class

24 measuring Current Set the DMM to Amps (to measure Current) Set it to the closest value above the target current you expect to measure + - SERIES CIRCUIT Red lead Break the circuit, so the current flows into and out of the DMM Black lead This is how we measure Amps in a circuit Page 24 - Cyber Security Class

25 General Rule. 1. Assuming the resistance does not change: As voltage increases, current increases. as voltage decreases, current decreases. 2. Assuming the voltage does not change: As resistance increases, current decreases. As resistance decreases, current increases. Page 25 - Cyber Security Class

26 RECAP!! What is Voltage? What is Current? What is Resistance? Page 26 - Cyber Security Class

27 Simple Circuits Series circuit oall in a row o1 path for electricity o1 light goes out and the circuit is broken Parallel circuit omany paths for electricity o1 light goes out and the others stay on Page 27 - Cyber Security Class

28 Resistor color chart Page 28 - Cyber Security Class

29 Production LAB Time Page 29 - Cyber Security Class

30 Testing diffrent Resistor Circuit Page 30 - Cyber Security Class

31 Log some data Open your log books On the next available space o Note the Date o Draw a table (add table label that says for a fixed 5 volt power supply Resistor Marked Value Resistor Measured Value Measured Voltage Expected Current Measured Current Page 31 - Cyber Security Class

32 Make so measurements On your lab book table, note the marked value of each Resistor The measure each Resistor and record the measured value o How do we do that? Page 32 - Cyber Security Class

33 Make so measurements On your lab book table, note the marked value of each Resistor The measure each Resistor and record the measured value o How do we do that? Page 33 - Cyber Security Class

34 Make so measurements On your lab book table, note the marked value of each Resistor The measure each Resistor and record the measured value o How do we do that? You have a 5 Volt supply, but it is not exact, so measure it too o How do we do that? Page 34 - Cyber Security Class

35 Make some measurements On your lab book table, note the marked value of each Resistor The measure each Resistor and record the measured value o How do we do that? You have a 5 Volt supply, but it is not exact, so measure it too o How do we do that? Page 35 - Cyber Security Class

36 Make some measurements The measure each Resistor and record the measured value o How do we do that? You have a 5 Volt supply, but it is not exact, so measure it too o How do we do that? Now Measure the current for each Resistor o How do we do that? Page 36 - Cyber Security Class

37 Make some measurements The measure each Resistor and record the measured value o How do we do that? You have a 5 Volt supply, but it is not exact, so measure it too o How do we do that? Now Measure the current for each Resistor o How do we do that? Page 37 - Cyber Security Class

38 Production Reference Slides Page 38 - Cyber Security Class

39 Resistance Opposition to the flow of current is resistance The fact that a wire can become hot from the flow of current is evidence of resistance. Conductors have very little resistance. Insulators have large amounts of resistance. Page 39 - Cyber Security Class

40 Conductors Have 1 valence electron Materials in which electrons can move freely from atom to atom are called conductors. In general all metals are good conductors. The purpose of conductors is to allow electrical current to flow with minimum resistance. Page 40 - Cyber Security Class

41 Insulators Have 8 valence electrons Materials in which electrons tend to stay put and do not flow easily from atom to atom are termed insulators. Insulators are used to prevent the flow of electricity. Insulating materials such as glass, rubber, or plastic are also called dielectrics, meaning they can store charges. Dielectric materials are used in components like capacitors which must store electric charges. Page 41 - Cyber Security Class

42 Semi-Conductors Have 4 valence electrons Materials which are neither conductors nor insulators Common semi conductor materials are carbon, germanium and silicone. Used in components like transistors Page 42 - Cyber Security Class

43 measuring voltage + - PARALLEL CIRCUIT Red lead Black lead This is how we measure volts in a circuit Page 43 - Cyber Security Class

44 measuring current Electric current is measured in amps (A) using an ammeter connected in series in the circuit. A Page 44 - Cyber Security Class

45 1 2 Page 45 - Cyber Security Class

46 measuring voltage This is how we draw a voltmeter in a circuit. V SERIES CIRCUIT V PARALLEL CIRCUIT Page 46 - Cyber Security Class

47 measuring voltage The electrical push which the cell gives to the current is called the voltage. It is measured in volts (V) on a voltmeter V Page 47 - Cyber Security Class

48 measuring current Electric current is measured in amps (A) using an ammeter connected in series in the circuit. A Page 48 - Cyber Security Class

49 measuring current This is how we draw an ammeter in a circuit. A A SERIES CIRCUIT PARALLEL CIRCUIT Page 49 - Cyber Security Class

STEAM Clown Production. Series Circuits. STEAM Clown & Productions Copyright 2017 STEAM Clown. Page 2

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