A heated pad for a reptile tank contains two heating resistors, P and Q, connected in series. The following data were recorded during a test of the pad.
| Quantity | Value |
|---|---|
| Resistance of resistor P | 4.0 Ω |
| Resistance of resistor Q | 12 Ω |
| Combined resistance of the two resistors | 16 Ω |
| Current in the resistors | 0.75 A |
| Energy transferred during the test | 3.6 kJ |
Calculate the potential difference across each resistor.
Calculate the rate at which the two resistors together transfer energy.
During the test, the resistors transferred the energy shown in the table. Calculate the length of time for which the current flowed.
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.