An engineer is testing an environmental control system for a telecommunications enclosure. To prevent component freezing, identical heating units are connected in parallel to a constant 24.0 V DC power bus. The engineer measures the total current drawn by the system as more heating units are activated in parallel.
| Number of active heating units | Total current drawn in A\text{A}A | Supply voltage in V\text{V}V |
|---|---|---|
| 1 | 0.80 | 24.0 |
| 2 | 1.60 | 24.0 |
| 3 | 2.40 | 24.0 |
| 4 | 3.20 | 24.0 |
| 5 | 4.00 | 24.0 |
Using the data in Table 1, explain what happens to the total equivalent resistance of the heating system as the number of active heating units in parallel increases.
59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance. Each one has a worked solution and a mark scheme showing where the marks go.