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प्रश्न
What is meant by the heating effect of current? Give two applications of the heating effect of current.
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उत्तर
When an electric current is passed through a high resistance wire, like nichrome wire, the resistance wire becomes very hot and produces heat. This is called the heating effect of current.
The heating effect of current is used in electric irons, electric heaters, electric ovens, filament bulbs etc. and it is also utilised in electric fuses.
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संबंधित प्रश्न
Name any two effects of electric current.
When current is switched ‘on’ in a room heater, it ______.
What is nichrome? State its one use.
Explain why, tungsten is used for making the filaments of electric bulbs.
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
If the current flowing through a fixed resistor is halved, the heat produced in it will become:
Give Scientific reason.
In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.
Identify the figure and give its use.
These days when current in the circuit suddenly increases _______ switches are used.
What is the heating effect of electric current?
Write two devices based on the heating effect of electric current.
Which of the following is correct?
An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:
The heating element of an electric iron is made up of:
What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.
Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the following figure. The current flowing in both the circuits is the same.
- Will the heat produced in both cases be equal? Explain.
- Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.
Explain why fuse wire is always connected in a series arrangement.
In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.
What is the heating effect of electric current?
