| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.05 |
| Score | 0% | 61% |
Which of the following is not a terminal on a transistor?
base |
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collector |
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input |
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emitter |
A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.
The valence shell of n insulator is how full of electrons?
more than half full |
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less than half full |
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half full |
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empty |
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.
The diameter of a number 12 wire is __________ the diameter of a number 6 wire?
triple |
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double |
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less than |
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more than |
The larger the number the smaller the diameter of the wire. So, the diameter of a number 12 wire is less than the diameter of a number 6 wire.
The volt is a unit of measurement for:
current |
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capacitance |
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voltage |
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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.
The voltage output of a transformer primarily depends on which of the following?
the number of turns in the wire of the coils |
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the conductor used for the wire in the coils |
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the diameter of the wire in the coils |
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the diameter of the coils |
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.