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Question
An electric heater draws a current of 5 A, when connected to 220 V mains. Calculate the resistance of its filament.
Numerical
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Solution
I = 5 A; V = 220 V; R = ?
By Ohm's law, \[V = I.R\]
\[\therefore R = \frac{V}{I}\]
\[= \frac{220}{5}\]
= 44 Ω
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