| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.SL.TZ1.18 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 18 | Adapted from | N/A |
Question
The electromotive force (emf) of a cell is defined as
A. the power supplied by the cell per unit current from the cell.
B. the force that the cell provides to drive electrons round a circuit.
C. the energy supplied by the cell per unit current from the cell.
D. the potential difference across the terminals of the cell.
Markscheme
A
Examiners report
At both levels the most popular response was D, with A, the correct answer, being the least popular. It must be stressed that candidates are expected to learn rigorous definitions.
