9.10 Electrical energy and power

Question 1

What is electrical power?

Answer 1

The rate of energy transfer by each electrical component. This depends on the current in the component and voltage across it.

Question 2

What is the equation for electrical power?

Answer 2

power = voltage x current
P = VI unit: Watt(W)

Question 3

What are the other equations for electrical power?

Answer 3

From P=W/t, W=VQ and Q=It,
W=VIt

From V=IR,
P=((I)^2)R or P=((V)^2)/R