| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
| 663 W | |
| 220 W | |
| 659 W | |
| 660 W |
The voltage output of a transformer primarily depends on which of the following?
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 number of turns in the wire of 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.
Which of the following is the preferred method for splicing wires?
wrap in small gauge wire |
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screw-on connectors |
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soldering |
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wire crimps |
Splicing is permanently joining two wires together. Splicing can be done with screw-on connectors or wire crimps but the preferred method for splicing is soldering. Soldering takes the most effort but results in a connection that is electrically and mechanically identical to the original wire.
The joule is a unit of measurement for:
energy |
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capacitance |
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power |
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resistance |
The joule is a unit of measurement for energy.
Why is an insulator a poor conductor of electricity?
an insulator is made of inorganic material |
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an insulator is made of organic material |
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an insulator has few free electrons |
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an insulator has many free electrons |
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.