| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
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 diameter of the coils |
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the diameter of the wire in the coils |
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the conductor used for the wire in 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.
The hertz is a unit of measurement for:
frequency |
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power |
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inductance |
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energy |
The hertz is a unit of measurement for frequency.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
negative, positive |
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positive, positive |
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negative, negative |
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positive, negative |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.
Why is an insulator a poor conductor of electricity?
an insulator has many free electrons |
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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 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.
A transformer utilizes an inductor to increase or decrease what in a circuit?
current |
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resistance |
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load |
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voltage |
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.