An electric space heater is connected to a wall socket using an insulated copper cable. During operation, the cable becomes very warm. Which modification to the cable would reduce the rate of heat generation within it?
Use a copper cable with a larger cross-sectional area.
Use a copper cable with a smaller cross-sectional area.
Use a longer copper cable.
Use a cable with a thicker layer of insulation.
132 exam-style questions on CIE IGCSE Physics 4.2.4a Resistance. Each one has a worked solution and a mark scheme showing where the marks go.