Edexcel IGCSE Physics 2.3 Heating effect of current
Practise linking current, resistance and energy transfer to the temperature rise in wires, rods and domestic heating components.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- explain heating in a coil by electron collisions transferring energy to lattice ions
- suggest why high-current rods or wires should be powered only briefly in a practical
2.3 Heating effect of current question 1
The photograph shows a hair dryer plugged into the mains supply.
The hair dryer contains a fuse.
The hair dryer has a current of 9.6 A .
The mains supply voltage is 230 V .
The hair dryer contains a coil of wire which is used to heat air passing through the hair dryer.
Explain why the coil of wire heats up when there is a current in it.
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