An electric iron is rated 1000W, 230V. What is the resistance of its elements?

Physics JAMB 2002

An electric iron is rated 1000W, 230V. What is the resistance of its elements?

  • 51.9Ω
  • 52.9Ω checkmark
  • 55.9Ω
  • 57.6Ω

The correct answer is: B

Explanation

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
Previous Question Next Question

Leave A Comment