Science
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.
Current Electricity
5 Likes
Answer
Given,
I = 15 A
R = 8 Ω
The rate at which the heat develops in the heater (P) = I2R
Substituting the values in the equation, we get
P = 15 x 15 x 8 = 1800 watt
Therefore, electric heater produces heat at the rate of 1800 W
Answered By
1 Like
Related Questions
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Explain the following:
Why is the tungsten used almost exclusively for filament of electric lamps?
Explain the following:
Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?