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An electric bulb is marked . Calculate electrical resistance of its filament. If five such bulbs…
An electric bulb is marked $200\text{V}, 100\text{W}$. Calculate electrical resistance of its filament. If five such bulbs are connected in series to a $200\text{V}$ supply, how much current will flow through them?
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From ISC 2018 Physics Paper 1, question 15(b).