Unit 19 Flashcards
Inductors and capacitors are energy _____ devices
Storage
The cost of electricity consumed is based on the unit of watts, and is billed on the number of _____ times the cost per _____
kilowatt-hours ; kWh
Utility companies charge based on what?
Power consumed
True power is expressed in what?
Watts
How do you calculate true power in an ac circuit?
Volts x Amps x Power Factor Multiplier
If you measure voltage and current in an inductive or capacitive circuit, and then multiply them together, you will obtain the circuit’s _______ power
Apparent
Apparent power is expressed in what?
Volt-amperes
Because the voltage and current reach their zero and peak values at the same time, there is no leading or lagging of the current to the voltage, therefore, the power factor of the load is 100 percent, this condition is called what?
Unity power factor
What is the formula used for efficiency calculations?
Efficiency = Output Watts / Input Watts
The relationship between true power, apparent power, and power factor can be stated as _______
PF = TP / AP
VA is used for sizing ______ and _______
Circuits ; equipment
When energy is not used for its intended purpose the condition is called ____
Power loss
Efficiency describes how much ____ energy is used for its intended useful purpos
Input
True power is the energy _____
Consumed
There will be power losses in these three areas
Conductors, the power supply, and the load itself
