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This video uses a comparison between an LED light and filament bulb to introduce efficiency (η).
The equation, %efficiency (η) = (useful energy out/total energy in) x100 is explained and then linked to rate of energy transfer (P=E/t).
A simple and effective practical demonstration of inertia using a spinning raw egg.
When the egg is spun its contents also spins. Momentarily stopping the egg does not stop its contents from spinning. On release the egg begins to spin again. The contents of the egg resist any change in its motion.
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