A resistor has a resistance of at room temperature and is connected to a supply

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A resistor has a resistance of

8\,\Omega

at room temperature and is connected to a

12\,\text{V}

supply. When it heats up, its resistance rises to

10\,\Omega

, and simultaneously the applied voltage is increased to

18\,\text{V}

. Under these new conditions, the electrical power dissipated by the resistor (a) increases by

50\%

(b) decreases by

20\%

80\%

(d) increases by

20\%