An engineer investigates the electrical characteristics of a thermoelectric cooling module designed for a portable medical incubator. She records the current drawn by the module at various potential differences in the table below:
| Potential difference (V) | Current (A) |
|---|---|
| 0.0 | 0.00 |
| 4.0 | 1.40 |
| 8.0 | 2.50 |
| 12.0 | 3.30 |
Calculate the electrical power supplied to the cooling module when the potential difference across it is 8.0 V8.0\text{ V}8.0 V.
Use the equation:
power=potential difference×current \text{power} = \text{potential difference} \times \text{current} power=potential difference×currentCalculate the total energy transferred to the cooling module if it is operated continuously at this potential difference (8.0 V8.0\text{ V}8.0 V) for 7.57.57.5 minutes.
Use the equation:
energy transferred=power×time \text{energy transferred} = \text{power} \times \text{time} energy transferred=power×time42 exam-style questions on OCR GCSE Physics Simple circuits. Each one has a worked solution and a mark scheme showing where the marks go.