An electrical power station transmits a constant electrical power P P\,P over transmission lines of total resistance RRR. If the transmission voltage is increased from V V\,V to 4V, what is the effect on the power lost as heat in the lines?
The power loss decreases to 116\frac{1}{16}161 of its original value.
The power loss decreases to 14\frac{1}{4}41 of its original value.
The power loss increases by a factor of 444.
The power loss increases by a factor of 161616.
69 exam-style questions on CIE IGCSE Physics 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.