An electrically operated gate contains a coil of wire. When the gate operates, the current in the coil is 1.5 A and the coil dissipates energy at a rate of 5.4 W.
Calculate the resistance value of the coil from these operating readings.
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.