Question

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 burn portion. The power it will consume now is

• A. more than 1 kW.
• B. less that 1 kW, but not zero.
• C. 1 kW.
• D. 0 kW

Answer 1

The correct option is A more than 1 kW.

$P_i=\frac{V_i^2}{R_i}$
Since, $R_i<R_i$ keeping V = constant
$V=V_f$
$P_i=\frac{V^2}{R_f}$
Since, $R\downarrow P\uparrow$