| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
What is the voltage of most household electrical systems in the United States?
60V |
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110V |
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60Hz |
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220V |
Most households use electricity with a voltage of 110V.
Why does current in an electric circuit create heat?
voltage is naturally hot |
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current is naturally hot |
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heat is created when the current overcomes resistance in the wire |
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the wire in the circuit burns when current passes through |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
This circuit component symbol represents a(n):
capacitor |
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transformer |
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resistor |
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inductor |
An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.
The volt is a unit of measurement for:
capacitance |
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voltage |
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current |
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power |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Why is an insulator a poor conductor of electricity?
an insulator is made of organic material |
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an insulator has many free electrons |
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an insulator has few free electrons |
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an insulator is made of inorganic material |
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.