| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Which of these materials is not a good conductor of electricity?
gold |
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air |
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tin |
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copper |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.
What is the primary difference between a rectifier and an inverter?
a rectifier strips out the DC portion of electricity while an inverter strips out the AC portion |
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a rectifier converts an AC input to DC while an inverter converts a DC input to AC |
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a rectifier converts a DC input to AC while an inverter converts an AC input to DC |
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a rectifier strips out the AC portion of electricity while an inverter strips out the DC portion |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.
The valence shell of a conductor is how full of electrons?
half full |
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full |
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less than half full |
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more 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 will help to prevent a short circuit?
resistor |
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fuse |
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diode |
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transistor |
Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.
The conversion of alternating current (AC) into direct current (DC) is called:
inductance |
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reactance |
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capacitance |
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rectification |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.