Basic Electricity Video Exam

Transcription

1 Name: Class: Date: Basic Electricity Video Exam Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Matter is made of. a. plasma, gas, and solid b. solid, liquid, and gas c. solid, liquid, and plasma d. liquid, vapor, plasma 2. Matter is composed of what three primary particles? a. Proton, electron, quarks b. Electron, neutrino, proton c. Proton, neutron, and electron d. Alieon, bozon, electron 3. What type of charge does an electron have? a. positive b. negative c. neutral d. negative-positive 4. What two atoms form the nucleus? a. Proton and neutron b. Proton and electron c. Electron and neutron 5. Unlike charges. a. repel b. attract c. are neutral d. cancel each other out 6. What force keeps electrons circling the proton/neutron? a. centrifugal force b. magnetic force c. nuclear force d. gravitational force 7. The maximum number of electrons in the valence shell of an atom is. a. 1 b. 4 c. 8 d. 16 1

2 Name: 8. What part of an atom moves from one atom to another? a. proton b. neutron c. electron d. molecule 9. If five electrons combine with three protons, the net charge will be. a. negative b. positive c. zero d. neutral 10. The best conductors have electrons in the valence shell. a. 1 or 2 b. 3 or 4 c. 5 or 6 d. 7 or The best conductors are. a. silver, copper, gold, aluminum b. steel, bronze, brass c. glass, rubber, plastic d. aluminum, nickel, magnesium 12. Typical insulators are. a. copper, silver, gold b. steel, bronze, brass c. glass, rubber, plastic, and wood d. aluminum, nickel, magnesium 13. The best insulators have electrons in the valence shell. a. 1 or 2 b. 3 or 4 c. 5 or 6 d. 7 or An ampere is. a. the difference in potential between two charges b. a measure of the quantity of electrons flowing past a point in the electrical circuit in a given time c. the unit of measure for resistance d. the unit of measure for capacitance 15. The unit of measure for the current flow of electrical energy is the. 2

3 Name: 16. The unit of measure for the electrical pressure forcing electrical energy through a conductor is the. 17. The unit of measure for the resistance to the flow of electrons in a circuits is the. 18. The unit of measure for the amount of power being used or consumed by a circuit is the. 19. Energy cannot be. a. moved b. changed c. created or destroyed 20. The amount of energy supplied to a device is proportional to. a. the flow rate and the pressure (amps and volts) b. the direction and the velocity c. the resistance and the volts 21. One BTU is equal to _. a. the energy required to raise one pound of water one degree Celsius b. the energy required to raise one pound of water one degree Fahrenheit c. the energy required to raise ten pounds of water one degree Celsius d. the energy required to raise ten pounds of water one degree Fahrenheit 22. One watt of electrical energy is equal to _ BTU per hour. a b. 3,412 c. 34,120 d. 341, Ohm s Law states that. a. Volts = Amps X Watts b. Watts = Amps X Ohms c. Volts = Amps X Ohms s = Volts X Ohms 3

4 Name: 24. In a DC circuit, the current is directly proportional to the. a. amperage b. resistance c. wattage d. voltage 25. In Ohms Law, the letter E is used to represent. a. I (intensity) or amperage b. R or resistance c. EMF or voltage d. P (power) or wattage 26. What happens to the current in a circuit if the resistance is increased? a. The current remains the same. b. The current increases. c. The current decreases. d. This cannot be determined. 27. To find the watts of electrical power in an electrical circuit, you multiply. a. ohms and amperes b. ohms and volts c. volts and amperes d. volts, amperes, and ohms 28. An element in an electric heating unit is applied to a 232-volt power supply. The current flow through the element is 19 amperes. What is the resistance of the element? a. 8 ohms b. 10 ohms c. 12 ohms d. 14 ohms 29. A 100 watt light bulb is plugged into a wall outlet providing 120 volts. What is the amperage in the circuit? a..6 amps b..833 amps c amps d amps 30. If two light bulbs are wired in series and one bulb burns out, the other bulb will. a. go out b. stay on c. stay on, but it will be dimmer d. stay on, but it will be brighter 31. In a series circuit, the current is. a. the same at any point in the circuit. b. different at any point in the circuit. c. varies at every point of the circuit 4

5 Name: 32. In a series circuit, the total resistance is. a. the same at any point in the circuit. b. different at any point in the circuit. c. the sum of the individual resistances 33. In a parallel circuit. a. there is only one path for current to flow b. there are multiple paths for the current to flow c. the amps are the same everywhere d. the amps always equals the volts 34. In a parallel circuit, the voltage is. a. the same across all branches. b. different at any point in the circuit. c. varies at every point of the circuit 35. Receptacles in a home or office are connected in _. a. series b. parallel c. series-parallel 36. As loads are added in a parallel circuit, the total resistance of the circuit. a. will increase b. will decrease c. will remain the same d. cannot be determined 37. As electric current flows, is generated. a. sparks b. light c. cooling d. heat 38. Larger current flow requires larger. a. conductors b. resistors c. voltages d. diodes 39. Circuit protection is obtained by using. a. small gauge wire b. more resistors c. fuses or circuit breakers d. diodes 5

6 Name: 40. are one-time devices which must be replaced if tripped. a. Breakers b. fuses c. Resistors d. Insulators True/False Indicate whether the statement is true or false. 41. In a circuit with two or more resistances in series, the total resistance in the circuit is the sum of the resistances. 42. If three bulbs are wired in parallel and one bulb burns out, the total current of the circuit will decrease. 43. In a circuit with two or more resistances in parallel, the total resistance in the circuit is the sum of the resistances in the circuit. 44. When calculating the total resistance of a parallel circuit, the result will always be lower than the lowest resistance. 45. One kilowatt of electrical energy is equal to 1,000,000 watts. 46. As the diameter of a wire increases, its resistance will also increase. 47. Multiple tripping of a circuit breaker can compromise the reliability of the breaker. Matching Match the correct items below for a Series Circuit: a. Current is the same everywhere d. Voltage = the sum of individual voltage drops across all circuits b. Current = sum of current in each branch e. Resistance = Sum of individual resistances c. Voltage are the same everywhere f. The reciprocal of the total R = sum of reciprocals of R of each branch 48. 1st rule for Series Circuits 49. 2nd rule for Series Circuits 50. 3rd rule for Series Circuits 6