| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
This circuit component symbol represents a(n):
fuse |
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potentiometer |
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transformer |
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inductor |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.
What is the voltage of most household electrical systems in the United States?
220V |
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110V |
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60V |
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60Hz |
Most households use electricity with a voltage of 110V.
The valence shell of a conductor is how full of electrons?
half full |
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more than half full |
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full |
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less than half full |
Conductors are elements that allow electrons to flow freely. Their valence shell is less than half full of electrons that are able to move easily from one atom to another.
Which of the following is not a characteristic of a step-up transformer?
the secondary voltage is higher than the primary voltage |
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the primary voltage is higher than the secondary voltage |
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increases voltage |
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has more turns in the secondary winding than in the primary winding |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
| 600 W | |
| 601.5 W | |
| 602 W | |
| 603 W |