An industrial electric kiln uses a metal wire heating element. When the potential difference across this heating element is increased, its electrical resistance is observed to rise.
Explain, in terms of the behavior of particles within the metal, why increasing the potential difference across the heating element leads to an increase in its resistance.
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.