| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
The hertz is a unit of measurement for:
power |
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frequency |
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energy |
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inductance |
The hertz is a unit of measurement for frequency.
Which of the following is not a characteristic of a step-up transformer?
increases voltage |
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has more turns in the secondary winding than in the primary winding |
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the primary voltage is higher than the secondary voltage |
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the secondary voltage is higher than the primary 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 ampere is a unit of measurement for:
inductance |
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power |
|
energy |
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current |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
The rate of flow of electrons per unit time is which of the following?
conductance |
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voltage |
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current |
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resistance |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
A solid state device has which of the following characteristics?
made entirely from semiconductor material |
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made entirely from insulative material |
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made entirely from conductive material |
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made from a mix of conductive and insulative material |
The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.