| 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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power |
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inductance |
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energy |
The hertz is a unit of measurement for frequency.
The formula specifying Ohm's law is which of the following?
V = I2R |
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V = IR |
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\(V = {R \over I}\) |
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\(V = {I \over R}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Voltage and current are __________ proportional.
indirectly |
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not |
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inversely |
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directly |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following is not a characteristic of a step-up transformer?
the primary voltage is higher than the secondary voltage |
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increases voltage |
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the secondary voltage is higher than the primary voltage |
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has more turns in the secondary winding than in the primary winding |
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.
This circuit component symbol represents a(n):
transistor |
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transformer |
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AC source |
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DC source |
In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.