Four laboratory centrifuges complete separate operating cycles. The table gives the energy supplied and the energy dissipated during each cycle.
| Centrifuge | Total energy input in J\mathrm{J}J | Dissipated energy in J\mathrm{J}J |
|---|---|---|
| J | 700 | 210 |
| K | 1200 | 300 |
| L | 900 | 180 |
| M | 600 | 90 |
Which of the centrifuges is the least efficient?
centrifuge L
centrifuge K
centrifuge J
centrifuge M
100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.