An electric iron is rated 1000W, 230V. What is the resist...
An electric iron is rated 1000W, 230V. What is the resistance of its elements?
51.9Ω
52.9Ω
55.9Ω
57.6Ω
Correct answer is B
Electric Power = IV = I2R = V2/R thus for a device rated 1000 W, 230V, from the relation P = V2/R, 1000 = (230)2/R
=> R = (230)2/1000
= 52900/1000 = 52.9Ω