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प्रश्न
Explain the heating effect of electric current.
उत्तर
- When an electric current passes through a wire, the electrical energy is converted to heat.
- In heating appliances, the heating element is made up of materials with high melting point. An example of such a material is nichrome (an alloy of nickel, iron and chromium).
- The heating effect of electric current has many practical applications.
- The electric bulb, geyser, iron box, immersible water heater are based on this effect.
- These appliances have heating coils of high resistance.
- Generation of heat due to electric current is known as the heating effect of electricity.
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संबंधित प्रश्न
An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?
The current passing through an electric kettle has been doubled. The heat produced will become:
(a) half
(b) double
(c) four time
(d) one-fourth
Why does tungsten metal used to make solenoid type coil in an electric bulb?
Write two devices based on the heating effect of electric current.
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:
(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.
(b) Is it safe to handle the bulb when the switch is OFF?
(c) Give a reason for your answer in (b).
______ wire is used in the filament of the bulbs.
A fuse is used in an electric circuit to stop high currents flowing through the circuit.
An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in
- kilowatt hour and
- joules.
An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.
