13 - Electrical Power Flashcards
1
Q
What are the ratios between a watt, a kilowatt, and a megawatt?
A
Watt - base unit of measurement
Kilowatt - 1,000 Watts
Megawatt - 1,000,000 Watts
2
Q
How much power is used by a 20 amp motor from a 120 v power source?
A
P = 20 x 120
P = 2,400 Watts or 2.4 Kilowatts
3
Q
What is the formula used to calculate electric power?
What is this formula called?
A
P = I x E
P = Power (watts)
I = Current (amps)
E = EMF or volts
It is called Watt’s Law
4
Q
How is power able to be calculated when using AC voltage?
A
