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प्रश्न
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: a current of 2 A flows through it for 10 s?
उत्तर
W = V x Q
= V x (I x t)
= 12 x 2 x 10 = 240 J
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संबंधित प्रश्न
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