CAIE IGCSE Physics Energy Transfers Between Stores

Practise tracing energy between named stores and describing transfer by mechanical or electrical work, heating, sound or electromagnetic waves.

Exam points

name the initial and final stores, such as gravitational to kinetic during a fall
link braking or friction to reduced kinetic energy and increased internal energy
identify mechanical work, electrical work, heating or waves as the transfer pathway

[Maximum number: 1]

Fig. 10.1 shows a lightning flash between a cloud and the ground beneath.

Fig. 10.1

The charge built up on the cloud before the lightning flash is 0.60 C . This charge is completely transferred to the ground by the lightning flash in $5.0 \times 10^{-5} \mathrm{~s}(0.000050 \mathrm{~s})$ .

Suggest what happens to the energy calculated in (b)(ii).

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1.7.1.2—Energy is transferred between stores question 1