A student calculates the theoretical thermal energy needed to raise the temperature of a copper block from 25∘C25^\circ\text{C}25∘C to 55∘C55^\circ\text{C}55∘C.
She then performs an experiment to measure the actual electrical energy supplied to a heater to cause this temperature change.
State whether the measured energy will be greater than, less than, or equal to the calculated energy, and explain why.
119 exam-style questions on CIE IGCSE Physics 2.2.2a Internal energy and temperature. Each one has a worked solution and a mark scheme showing where the marks go.