S6 electricity - 4. electrical energy and power

Question 1

define power

Answer 1

power (P) is defined as the rate of transfer of energy.

Question 2

state the formula for power in electrical circuits

Answer 2

P=VI

P = power
V = potential difference
I = current

Question 3

state the other power equations

Answer 3

P = V² / R

P = I² x R

Question 4

State the equations of energy

Answer 4

E = V x I x t

E = V²/R x t

E = I² x R x t