Multiple choice

If a device has a resistance of 10 Ω and current of 3 A, then calculate the heat developed in 20 s.

  1. 18 J

  2. 1800 J

  3. 0.005 J

  4. 0.5 J

  5. 4.5 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electric current  = 3 A, Resistance  = 10 Ω, Time  = 20 s V = I x R = 3 x 10 = 30 V Heat produced = V x I x t = 30 x 3 x 20 = 1800 J

Keep practicing — related questions