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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

Answer B.
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.
  • Reactive power.
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