A deep-sea exploration vehicle is supplied with electrical energy from a surface ship via a tether at a potential difference of 15,000 V15,000\text{ V}15,000 V.
The energy transferred down the tether in one second is 525,000 J525,000\text{ J}525,000 J.
Calculate the charge flow down the tether in one second. Use the equation:
charge flow=energypotential difference \text{charge flow} = \frac{\text{energy}}{\text{potential difference}} charge flow=potential differenceenergyInside the exploration vehicle, the voltage is stepped down to 120 V120\text{ V}120 V to run the scientific instruments. The table below shows the operating current of three critical sensors:
| Sensor | Current (A) |
|---|---|
| Sonar Array | 4.15 |
| Telemetry Uplink | 1.35 |
| HD Camera System | 2.50 |
Calculate the total power consumed when all three sensor systems are running at the same time. Use the equation:
power=potential difference×current \text{power} = \text{potential difference} \times \text{current} power=potential difference×current44 exam-style questions on AQA GCSE Physics 1.1 Energy changes in a system, and the ways energy is stored before and after such changes, covering 1.1.1 Energy stores and systems, 1.1.2 Changes in energy, 1.1.3 Energy changes in systems, and 1.1.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.