24 13 Look at the diagram of a generator. coil N coil rotated
slip ring
S
axle magnet brush lamp wire
(a) The coil is rotated. Explain how the generator works and why slip rings are used. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [3] (b) The coil is rotated faster. Describe and explain what happens to the output voltage. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [3]
Š OCR 2015