Heating Effect of Electric Current
Heating Effect Of Electric Current:
Whenever electric current is passed through a conductor. It gets heated up. This means that electrical energy gets converted into heat energy and this effect is known as joule’s heating effect of electric current being first proposed by joule.
Factors on which heating effect depends :
There are two factors on which heating effect of current depends :
1. Resistance of wire :
Greater is the resistance of wire, greater will be heat produced in it by a given current. e.g. if we choose two wires, one of the copper and other is nichrome of equal length and equal thickness and pass equal amount of current through them for the same duration, then we will notice that nichrome wire will become more hot in comparison to the copper wire. It is due to the reason that resistance of nichrome wire is more than that of copper wire.
2. Magnitude of current passed through given wire :
If the magnitude of the current passed through the given wire is greater, then the heat produced in it will also be greater. For e g : If a normal amount of current flow through a copper wire of household electric wiring then the wires do not become hot but if a large current flows in the same wiring accidently, then the wires become extremely hot and a fire may be started.
Select the one in which heating effect of current is not used. | |||
| Right Option : D | |||
| View Explanation | |||
The heating effect of electric current is utilized in a safety device called' _____________________ . | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) The factors on which heating effect depends is the magnitude of the current passed through the given wire. (b) The example of using of heating effect for production of light is the electric bulbs . | |||
| Right Option : C | |||
| View Explanation | |||
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