Question:
An electric bulb, when connected across a power supply of $220 \mathrm{~V}$, consumes a power of $60 \mathrm{~W}$. If the supply drops to $180 \mathrm{~V}$, what will be the power consumed? If the power supply is suddenly increased to $240 \mathrm{~V}$, what will be the power consumed?
Solution:
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