| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
You would measure the amount of resistance at a certain point in a circuit with a(n):
ohmmeter |
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ammeter |
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potentiometer |
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voltmeter |
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.
You would measure the amount of current through a circuit with a(n):
potentiometer |
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voltmeter |
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battery |
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ammeter |
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.
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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link the temperature of one component in the circuit to that of another component in the circuit |
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keep the circuit at a designated safe temperature |
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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.
Which of the following is not a purpose of a resistor in an electrical circuit?
multiply the current in the circuit |
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limit the current in the circuit |
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moderate the heat in the circuit |
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control the voltage in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
The ampere is a unit of measurement for:
power |
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current |
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inductance |
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energy |
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.