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NCCER Electricity Level 3 Section 9 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified £7.99
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NCCER Electricity Level 3 Section 9 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified
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NCCER Electricity Level 3 Section 9 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What happens to the current when the voltage in a circuit is increased? Increasing the voltage causes the current to increase as well, according to Ohm’s Law, assuming the resistan...

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  • January 4, 2025
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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NCCER Electricity Level 3 Section 9
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What happens to the current when the voltage in a circuit is increased?


✔✔Increasing the voltage causes the current to increase as well, according to Ohm’s Law,

assuming the resistance stays constant.




Why do power plants use alternating current (AC) for long-distance power transmission?


✔✔AC can be easily transformed into higher or lower voltages, which makes it more efficient

for transmitting power over long distances with minimal energy loss.




What is the purpose of a busbar in an electrical system?


✔✔A busbar is a conductive material that distributes electricity from one source to multiple

circuits, acting as a central hub for power distribution.




What does a ground fault interrupt in an electrical system?


✔✔A ground fault interrupts the flow of electricity if there is an unintended path to the ground,

protecting people from electrical shock.




1

, What is a variable frequency drive (VFD) used for in electrical systems?


✔✔A VFD is used to control the speed and torque of an electric motor by adjusting the

frequency of the power supply.




How does a light dimmer switch work?


✔✔A dimmer switch works by adjusting the power supplied to the light, often by chopping the

AC waveform to reduce the amount of energy delivered.




What could happen if you connect a 240V device to a 120V outlet?


✔✔The device may not work properly or could be damaged, as it is receiving less voltage than it

requires for operation.




Why are insulated wires used in electrical circuits?


✔✔Insulated wires prevent accidental contact with conductive materials or other wires, reducing

the risk of electrical shock or short circuits.




What does a wattmeter measure?


✔✔A wattmeter measures the amount of power, in watts, that is being used in a circuit.




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