Your Results | Global Average | |
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Questions | 5 | 5 |
Correct | 0 | 3.22 |
Score | 0% | 64% |
Electromotive force is another name for:
current |
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voltage |
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power |
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energy |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
A transformer utilizes an inductor to increase or decrease what in a circuit?
voltage |
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resistance |
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current |
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load |
A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.
In metals, increasing the temperature typically _____________ conductivity.
increases |
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eliminates |
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decreases |
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does nothing to |
All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.
The watt is a unit of measurement for:
power |
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frequency |
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resistance |
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energy |
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.
The volt is a unit of measurement for:
voltage |
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current |
|
power |
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capacitance |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.