Q1
The heating effect of current is used in:
Aan electric heater
Ba compass
Ca magnet
Da mirror
CBSEClass 8 (CBSE)ScienceCh 4 · Topic 2
Heating Effect of Electric Current
Learning that electric current produces heat when passing through a resistor.
Core concept
The amount of heat produced depends on the current strength, the resistance of the wire, and the time current flows — this relationship, discovered by James Prescott Joule, is used to calculate electrical heating precisely. This same heating effect is also the basis for electrical fuses — thin wires designed to melt and break the circuit if current becomes dangerously high, protecting appliances and preventing electrical fires.
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• The heating effect occurs when current flows through a resistor, producing heat.
• Nichrome wire is commonly used in heating appliances due to its high resistance.
• Heat produced depends on current strength, resistance, and time (Joule's law).
• Fuses use the heating effect to melt and break a circuit if current is too high, preventing fires.