| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
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 coils |
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the number of turns in the wire of the coils |
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the diameter of 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.
Which of the following will increase the magnetic field produced by the electric current in a wire?
construct the wire from insulative material |
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wrap the wire around a ceramic core |
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construct the wire from conductive material |
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wind the wire into a coil |
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.
What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?
light emitting diode |
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standard diode |
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v-type diode |
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zener diode |
A diode allows current to pass easily in one direction and blocks current in the other direction. A zener diode is a diode which allows current to flow in one direction as normal and will also allow current flow in the reverse direction when the voltage is above a certain value. This value is called the breakdown voltage.
This circuit diagram represents a(n):
open circuit |
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parallel circuit |
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series-parallel circuit |
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series circuit |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.
The hertz is a unit of measurement for:
power |
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energy |
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inductance |
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frequency |
The hertz is a unit of measurement for frequency.