a. The power of an electric appliance is given by the formula P=I^2R, where I is the current and R is resistance. Use this information to explain how you can use radicals to determine the current if the power and the resistance is given.

Question

b. Find the current in amperes if a 40-watt bulb has a resistance of 3 ohms.

Answer 1

P = I^2 R
plug in your given

40 = I^2 (3)
40/3 = I^2
I = √(40/3) = ...