A battery-powered environmental sensor is running on a battery that has only 30 C of charge left before it goes flat.
The sensor operates in two stages.
| Stage | Current | Duration |
|---|---|---|
| 1 | 0.30 A | 60 s |
| 2 | 0.20 A | until the battery goes flat |
Calculate the total time the sensor operates before the battery goes flat.
82 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.