| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
What is the voltage of most household electrical systems in the United States?
60V |
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110V |
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60Hz |
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220V |
Most households use electricity with a voltage of 110V.
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.
The hertz is a unit of measurement for:
inductance |
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energy |
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power |
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frequency |
The hertz is a unit of measurement for frequency.
Electrical power is measured in:
coulombs |
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amperes |
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watts |
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volts |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.
What is the potential difference in an electrical circuit a measure of?
the resistance at a specific location in the circuit |
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the load at a specific location in the circuit |
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the current at a specific location in the circuit |
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the voltage at a specific location in the circuit |
Electrons flow from an area of high concentration to an area of low concentration. A high voltage indicates a high concentration of electrons that creates a greater potential for electron flow than a low voltage. When applied to a load, voltage creates electricity and potential difference is the measure of voltage at a specific location in an electrical circuit.