An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Slide64.JPG

Slide65.JPG

  1. Class 10
  2. Chapter 12 Class 10 - Electricity

Transcript

NCERT Question 17 An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater. Given Resistance = R = 8 Ξ© Current = I = 15 A Time = t = 2 hours We know that, Rate at which heat is developed = πΈπ‘›π‘’π‘Ÿπ‘”π‘¦/π‘‡π‘–π‘šπ‘’ = Power Now, Power = I2 R = (15)2 (8) = 225 Γ— 8 = 1800 W Rate of change of heat is 1800 W Note: This answer does not match the end of the book answer. If we have made a mistake, please comment below

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.