| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
The watt is a unit of measurement for:
energy |
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resistance |
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power |
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frequency |
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.
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the faster electron flow will be |
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the less resistive the conductor is the slower electron flow will be |
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electrically conductive materials have no resistive properties |
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the more resistive the conductor is the slower electron flow will be |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
Which of the following can conduct electricity under some conditions but not others?
insulator |
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conductor |
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semiconductor |
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resistor |
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.
In electrical wiring, which of the following are proportional?
the length of the wire and the amount of the current |
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the length of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the current |
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the diameter of the wire and the amount of the voltage |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.
An engineer who wants to document an electric circuit would create which of the following?
a schematic |
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a blueprint |
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a matrix |
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a layout |
A schematic is the proper name for a drawing of an electric or electronic circuit.