An industrial furnace uses a thick metallic alloy wire as a heating element. When the potential difference across the heating element is increased, its electrical resistance is observed to rise.
Explain, in terms of the behavior of particles within the metallic lattice, why the resistance of the heating element increases as the potential difference across it is increased.
59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance. Each one has a worked solution and a mark scheme showing where the marks go.