Electricity is transmitted from a power station to a distant town using a copper cable of resistance 1.8 Ω1.8\ \Omega1.8 Ω. Power loss occurs because of the resistance of the cable.
The current in the cable is 300 A300\text{ A}300 A.
Calculate the power loss in the cable.
The copper cable is replaced with a new copper cable of the same length. The current remains at 300 A300\text{ A}300 A. The diameter of the new cable is three times the diameter of the original cable.
State and explain how the power loss is affected by this change.
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.