Question

if the voltage across a bulb rated 220v-100w drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is​

Answer 1

Answer:

4.9375%

Explanation:

we know power depends on (voltage)². So, when voltage drops by 2.5%, hence (new voltage)²= 0.950625v². Hence power decrease is 100-95.0625=4.9375%

Answer 2

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