A length of resistance wire is connected to a variable power supply. The resistance of the wire remains constant as the supply setting is changed.
At one setting, the potential difference across the wire is 6.0 V and the current is 0.40 A. The potential difference is then increased to 9.0 V. Calculate the new power dissipated in the wire.
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.