| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
Which of the following will increase the magnetic field produced by the electric current in a wire?
wrap the wire around a ceramic core |
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wind the wire into a coil |
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construct the wire from conductive material |
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construct the wire from insulative material |
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.
Why does current in an electric circuit create heat?
current is naturally hot |
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heat is created when the current overcomes resistance in the wire |
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voltage is naturally hot |
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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.
| 3000 W | |
| 3001.5 W | |
| 1500 W | |
| 3002 W |
In electrical wiring, which of the following are proportional?
the length of the wire and the amount of the current |
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the diameter of the wire and the amount of the voltage |
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the length of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the current |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.
Voltage and current are __________ proportional.
not |
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indirectly |
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directly |
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inversely |
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.