| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
You would measure the amount of resistance at a certain point in a circuit with a(n):
ohmmeter |
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voltmeter |
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ammeter |
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potentiometer |
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.
Resistance is opposition to which of the following?
current |
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voltage |
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impedance |
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conductance |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
positive, negative |
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negative, positive |
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positive, positive |
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negative, negative |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.
In an electrical circuit, resistors have fixed or __________ resistance.
parallel |
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variable |
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dynamic |
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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.
This circuit component symbol represents a(n):
potentiometer |
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fuse |
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transformer |
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inductor |
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.