A current passes through the metal strips of a rear-window demister.
Which statement describes the effect of collisions with drifting electrons on the positive ions in the metal strips?
They drift slowly in one direction through the metal strips.
They vibrate with a smaller amplitude about their fixed positions.
They move rapidly in random directions throughout the metal strips.
They vibrate with a larger amplitude about their fixed positions.
105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.