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प्रश्न
An electric heater is rated 750 W – 200 V. Calculate (a) resistance of the heating element (b) current flowing through it.
संख्यात्मक
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उत्तर
P = 750 W; p.d. = 200 V; R = ?; I = ?
(a)\[\text{P} =\frac{\text{V}^{2}}{\text{R}}\]
\[\therefore \text{R}=\frac{\text{V}^{2}}{\text{P}}\]
\[=\frac{200 \times 200}{750}\]
= 53.33 Ω
(b) \[\text{R} = \frac{\text{V}}{\text{I}}\]
\[\therefore \text{I} = \frac{\text{V}}{\text{R}}\]
\[= \frac{200}{53.33}\]
= 3.75 A
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