or
Subelement A
Principles
Section 1
Electrical Elements
The product of the readings of an AC voltmeter and AC ammeter is called:
Apparent power.
• True power.
• Power factor.
• Current power.
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What is the basic unit of electrical power?
• Ohm.
Watt.
• Volt.
• Ampere.

Wattage is the basic unit of electrical power. It can be determined by multiplying the voltage by the current.

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What is the term used to express the amount of electrical energy stored in an electrostatic field?
Joules.
• Coulombs.
• Watts.
• Volts.
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What device is used to store electrical energy in an electrostatic field?
• Battery.
• Transformer.
Capacitor.
• Inductor.
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What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?
• XL = πƒ L
XL = 2πƒ L
• XL = 1 / 2πƒ C
• XL = 1 / R2+X2

XL = 2(pi)fL
or
2 x (3.1416) x (freq. in Hz) x (inductance in henry)

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What is the term for the out-of-phase power associated with inductors and capacitors?
• Effective power.
• True power.
• Peak envelope power.