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25 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What constitutes a capacitor |
Two conductors separated by an insulator |
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What is the purpose of a capacitor |
It stores electrical energy in electrostatic fields |
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Does a capacitor in an AC circuit cause the current to lead or lag the voltage |
It causes the current to lead the voltage |
ELI or ICE |
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What is the basic unit of capacitance |
The farad |
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Why should electrolytic capacitors not be used in an AC circuit |
They are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity |
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What is meant by inductance |
The ability to store electrical energy in electromagnetic fields |
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What is the basic unit of inductance |
The Henry |
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What is an example of an indicator used in a magneto |
The coil |
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Does an inductor in an AC circuit cause the current to lead or lag the voltage |
It causes the current to lag behind the voltage |
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How can you find polarity of an electromagnet |
Hold the electromagnet in your left hand with your fingers encircling the coil in the direction electrons flow (from negative to positive). Your think will point to the north Pole of electromagnet |
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What is meant by impedance |
The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance, and inductive reactance |
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In what unit is impedance measured |
In ohms |
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What are five sources of electrical energy |
Magnetism, heat, chemical energy,light, and pressure |
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What is the basic unit of Power in a DC circuit |
The Watt |
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What is meant by a kilowatt |
1,000 watts |
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What is meant by a megawatt |
1,000,000 watts |
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What is the formula for power in a DC circuit |
Power=current x voltage P=IxE |
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What is the relationship between mechanical power and electrical power |
1 horsepower = 746 watts |
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What is meant by true per in an AC circuit |
The product of the circuit voltage and the current that is in phase with this voltage |
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In what unit is trigger True power expressed |
In watts |
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What is meant by apparent power in an AC circuit |
The product of the circuit voltage and circuit current |
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In what unit is apparent power expressed |
Volt-amps |
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What is meant by reactive power in an AC circuit |
The power consumed in the inductive and capacitive reactance in an AC circuit. Reactive power is also called wattless power |
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I'm what units units is reactive power expressed |
In volt-amps reactive (VAR), or kilovolt-amps (KVAR) |
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What is meant by power factor in an AC circuit |
The ratio of true power to apparent power. It is also the ratio of circuit resistance to circuit impedance |
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