Power and Electrical Energy

Question 1

What is the def of equation of power?

Answer 1

Rate of work done. P(power) = W(work done)/t(time)

Question 2

What is the derived equation of the power of electrical devices?

Answer 2

P = VQ/t = VIt/t = VI therefore P = VI

Question 3

What is the derived power equation using ohms law?

Answer 3

V = IR therefore substitute IR and P = I^2 R or
P = V^2/R

Question 4

What is the equation of energy?

Answer 4

W(work done) = VIt
W = V^2/R x t
W = I^2 Rt