Physics Review Question Unit: waves Year: 1992 Question#: 30 Question: What is the approximate amount of electrical energy needed to operate a 1,600-watt toaster for 60. seconds? (1 ) 27j (2 ) 1,500j (3 ) 1,700j (4 ) 96000j What is this question really asking? Explanation by: Danielle [ Return to question menu ] Answer 1 27j INCORRECT you don't divide 1600watts by 60s to find electrical energy Try P=W/t return to top Answer 2 1500j INCORRECT Try the formula P=W/t return to top Answer 3 1700j INCORRECT Try the formula P=W/t return to top Answer 4 96000j CORRECT You used the formula P=W/t correctly, where P = 1600 watts t = 60 s W = the energy used (work done) return to top What's this question really asking? What is the work done by this appliance? return to top |
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