Calculate And Measure Electrical Power Flashcards
What are five sources of electrical energy?
Magnetism, chemical energy, light, heat, and pressure.
What is the basic unit of power of electrical energy?
The watt.
What is meant by a kilowatt?
1,000 watts.
What is meant by a megawatt?
1,000,000 watts
What is the formula for power in a DC circuit?
Power=voltage times current (p=e.i)
What is the relationship between mechanical and electrical power?
1 horsepower=746 watts.
What is meant by true power in an AC circuit?
The product of the circuit voltage and the current that is in phase with this voltage.
In what units is true power expressed?
In watts.
What is meant by apparent power in an AC circuit?
The product of the circuit voltage and the circuit current.
In what units is apparent power expressed?
In volt-amps.
What is meant by reactive power in a AC circuit?
The power consumed in the inductive and capacitive reactances in an AC circuit. Reactive power is also called wattless power.
In what units is reactive power expressed?
In volt-amps reactive (VAR), or kilovolt-amps reactive (KVAR).
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.
