| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.02 |
| Score | 0% | 60% |
In an electronic circuit, a thermocouple can be used to:
increase or decrease the temperature of a component in the circuit |
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keep the circuit at a designated safe 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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open or close a circuit at a designated 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 diameter of a number 12 wire is __________ the diameter of a number 6 wire?
triple |
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double |
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more than |
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less 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.
What is the voltage of most household electrical systems in the United States?
110V |
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60Hz |
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60V |
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220V |
Most households use electricity with a voltage of 110V.
In an electrical circuit, resistors have fixed or __________ resistance.
dynamic |
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variable |
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parallel |
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series |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.
The ampere is a unit of measurement for:
inductance |
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current |
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energy |
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power |
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.