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To solve the question : an electric bulb is rated 220 v and 100 w. When it's operated on 110 v, the power consumed will be ______, the formula P = V^2/R is used, why can't the formula P = VI be used ?

To solve the question : an electric bulb is rated 220 v and 100 w. When it's operated on 110 v, the power consumed will be ______, the formula P = V^2/R is used, why can't the formula P = VI be used ?

Grade:10

1 Answers

IHate Ppts
101 Points
4 years ago
The formula you suggested is better in this case because we already know power and voltage and we can get current and we can substitute in second equation. On the other hand, if we usd P=V2/R, we first would have to calculate R for each case and proceed, which is lengthy.

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