An electric heater consists of a nichrome coil and runs under 220 V, c

1.	An electric heater consists of a nichrome coil and runs under 220 V, consuming 1 kW power. Part of its coil burned out and it was reconnected after cutting off the burnt portion. The power it will cunsume now is(a) more than 1 kW(b) less than 1 kW, but not zero(c) 1 kW(d) 0 kW
Answer» Answer is : (a) more than 1 kW Power P = V²/R as V remains constant in given condition, while current changes as resistance is reduced. Power consumed by heater coil P ∝ 1/R. On cutting part of coil, its resistance decreases. So, power consumed by coil increases and it will be more than 1 kW.

An electric heater consists of a nichrome coil and runs under 220 V, consuming 1 kW power. Part of its coil burned out and it was reconnected after cutting off the burnt portion. The power it will cunsume now is(a) more than 1 kW(b) less than 1 kW, but not zero(c) 1 kW(d) 0 kW

Answer»

Answer is : (a) more than 1 kW

Power P = V²/R as V remains constant in given condition, while current changes as resistance is reduced.

Power consumed by heater coil P ∝ 1/R.

On cutting part of coil, its resistance decreases. So, power consumed by coil increases and it will be more than 1 kW.

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An electric heater consists of a nichrome coil and runs under 220 V, consuming 1 kW power. Part of its coil burned out and it was reconnected after cutting off the burnt portion. The power it will cunsume now is(a) more than 1 kW(b) less than 1 kW, but not zero(c) 1 kW(d) 0 kW

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