An engineer investigates how connecting identical micro-heating elements in parallel affects the total current drawn from a constant voltage source.
They measure the total current from a 5.00 V power supply as they vary the number of parallel elements.
Table 1 shows their results.
Table 1
| Number of micro-heating elements | Current in mA | Voltage in V |
|---|---|---|
| 5 | ? | 5.00 |
| 4 | 93.6 | 5.00 |
| 3 | 70.2 | 5.00 |
| 2 | 46.8 | 5.00 |
| 1 | 23.4 | 5.00 |
Using the data in Table 1, predict the current from the power supply when there are 5 micro-heating elements connected in parallel.
32 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.