| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.32 |
| Score | 0% | 66% |
Which of the following is the formula for calculating electrical power?
P = IV |
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\(P = {V \over I}\) |
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\(P = {I \over V}\) |
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P = I2V |
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 is not a characteristic of a step-up transformer?
has more turns in the secondary winding than in the primary winding |
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the secondary voltage is higher than the primary voltage |
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the primary voltage is higher than the secondary voltage |
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increases voltage |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
The joule is a unit of measurement for:
resistance |
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capacitance |
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energy |
|
power |
The joule is a unit of measurement for energy.
The diameter of a number 12 wire is __________ the diameter of a number 6 wire?
less than |
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double |
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triple |
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more than |
The larger the number the smaller the diameter of the wire. So, the diameter of a number 12 wire is less than the diameter of a number 6 wire.
| 3600 W | |
| 1800 W | |
| 1980 W | |
| 1620 W |