| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
The hertz is a unit of measurement for:
frequency |
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inductance |
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energy |
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power |
The hertz is a unit of measurement for frequency.
The valence shell of a semiconductor 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 |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.
Which of the following is the formula for calculating electrical power?
P = IV |
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\(P = {I \over V}\) |
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P = I2V |
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\(P = {V \over I}\) |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.
An engineer who wants to document an electric circuit would create which of the following?
a schematic |
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a matrix |
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a blueprint |
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a layout |
A schematic is the proper name for a drawing of an electric or electronic circuit.
This circuit component symbol represents a(n):
potentiometer |
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fuse |
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transformer |
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inductor |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.