| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.16 |
| Score | 0% | 63% |
A transformer utilizes an inductor to increase or decrease what in a circuit?
voltage |
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resistance |
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current |
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load |
A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.
Why is an insulator a poor conductor of electricity?
an insulator has few free electrons |
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an insulator is made of organic material |
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an insulator is made of inorganic material |
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an insulator has many free electrons |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
low voltage |
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stationary |
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high voltage |
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moving |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
The joule is a unit of measurement for:
power |
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resistance |
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energy |
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capacitance |
The joule is a unit of measurement for energy.
What is the voltage of most household electrical systems in the United States?
60V |
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110V |
|
60Hz |
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220V |
Most households use electricity with a voltage of 110V.