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.

Asked by Vishal kumar | 2 years ago |  486

##### Solution :-

The rate at which the heat develops in the heater can be calculated using the following formula

P = I2 R

Substituting the values in the equation, we get

P = (15A) 2 × 8 Ω = 1800 J/s

The electric heater produces heat at the rate of 1800 J/s

Answered by Shivani Kumari | 2 years ago

### Related Questions

#### Explain the following. a. Why is the tungsten used almost exclusively for filament of electric lamps?

Explain the following.

a. Why is the tungsten used almost exclusively for filament of electric lamps?

b. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

c. Why is the series arrangement not used for domestic circuits?

d. How does the resistance of a wire vary with its area of cross-section?

e. Why copper and aluminum wires are usually employed for electricity transmission?

#### Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

#### Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to the electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

#### Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors

Compare the power used in the 2 Ω resistor in each of the following circuits:

(i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and

(ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.