| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
Which of the following is not a purpose of a resistor in an electrical circuit?
control the voltage in the circuit |
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moderate the heat in the circuit |
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multiply the current in the circuit |
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limit the current in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
Which of the following will increase the magnetic field produced by the electric current in a wire?
wrap the wire around a ceramic core |
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construct the wire from insulative material |
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wind the wire into a coil |
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construct the wire from conductive material |
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.
An engineer who wants to document an electric circuit would create which of the following?
a layout |
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a blueprint |
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a matrix |
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a schematic |
A schematic is the proper name for a drawing of an electric or electronic circuit.
This circuit component symbol represents a(n):
transistor |
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capacitor |
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diode |
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inductor |
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.
What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?
v-type diode |
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light emitting diode |
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standard 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.