Why does the cord of an electric heater not glow while the heating element does?

Asked by Vishal kumar | 2 years ago |  192

1 Answer

Solution :-

The heating element of an electric heater is made of an alloy which has a high resistance. When the current flows through the heating element, the heating element becomes too hot and glows red. The cord is usually made of copper or aluminium, which has low resistance. Hence, the cord doesn’t glow.

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?

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?

Class 10 Science Electricity View Answer

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.

Class 10 Science Electricity View Answer

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

Class 10 Science Electricity View Answer

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?

Class 10 Science Electricity View Answer

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.

Class 10 Science Electricity View Answer