| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
The hertz is a unit of measurement for:
energy |
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inductance |
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frequency |
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power |
The hertz is a unit of measurement for frequency.
In an electronic circuit, a thermocouple can be used to:
open or close a circuit at a designated temperature |
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link the temperature of one component in the circuit to that of another component in the circuit |
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increase or decrease the temperature of a component in the circuit |
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keep the circuit at a designated safe temperature |
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
The rate of flow of electrons per unit time is which of the following?
resistance |
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current |
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conductance |
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voltage |
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.
You would measure the amount of resistance at a certain point in a circuit with a(n):
potentiometer |
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ammeter |
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voltmeter |
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ohmmeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
This circuit component symbol represents a(n):
transistor |
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DC source |
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transformer |
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AC 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.