| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
Which of the following is not a characteristic of a step-up transformer?
the secondary voltage is higher than the primary voltage |
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increases voltage |
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the primary voltage is higher than the secondary 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.
Inductance is a factor in which of the following?
an AC circuit |
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determining energy stored by a capacitor |
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batteries connected in serial |
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a DC circuit |
Inductance is a property of an AC circuit (or a component in an AC circuit) that quantifies resistance to changes in current. The current in an AC circuit is continuously changing and inductive reactance (the opposition to change) depends both on the inductance of the circuit or component and the rate at which the current is changing.
| 200 W | |
| 440 W | |
| 402 W | |
| 400 W |
You would measure the amount of current through a circuit with a(n):
battery |
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ammeter |
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potentiometer |
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voltmeter |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.
Voltage and current are __________ proportional.
not |
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inversely |
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indirectly |
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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.