Physics Review Question Unit: electricity Year: 1988 Question#: 33 Question: If the power developed in an electric circuit is doubled, the energy used in one second is (1 ) halved (2 ) doubled (3 ) quartered (4 ) quadrupled What is this question really asking? Explanation by: Jill S [ Return to question menu ] Answer 1 halved INCORRECT To find out what happened to the energy if the power doubled you have to use the equation P=W/t. P=W/t 2P=1/2W/t This equation is not equal therefore halved is not the correct answer. return to top Answer 2 doubled CORRECT To find out what happened to the energy if the power doubled you have to use the equation P=W/t. P=W/t 2P=2W/t -this equation is still equal. Therefore this answer has to be correct. return to top Answer 3 quartered INCORRECT To find out what happened to the energy if the power doubled you have to use the equation P=W/t. P=W/t 2P=1/4W/t this equation is still not equal, therefore it is not the correct answer. return to top Answer 4 quadrupled INCORRECT To find out what happened to the energy if the power doubled you have to use the equation P=W/t. P=W/t 2P=4W/t This equation is not still equal, therefore it can not be the correct answer. return to top What's this question really asking? What happens to the energy in an electric circuit if the power is doubled? return to top |
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