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प्रश्न
An electric heater draws a current of 3.5 A at a p.d. of 250 V. Calculate the power of 4 such heaters.
संख्यात्मक
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उत्तर
I = 3.5 A; p.d. = 250 V
∴ Power of one heater = I × V
= 3.5 × 250
= 875 W
∴ Power of 4 heaters = 875 × 4 = 3500 W
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