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Physics
 Online Tutoring : Forum : Homework Help - Physical Sciences : Physics
Topic Topic: electric circuits Post ReplyNew Question
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Dianarows
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Joined: 05 May 2007
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Posted: 05 May 2007 at 6:40am | IP Logged Quote Dianarows

A small motor draws a current of 1.77 A from a 135 V line. The output power of the motor is 0.20 hp.
(a) At a rate of $0.060/kWh, what is the cost of operating the motor for 2.0 h?
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Hmuthu
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Joined: 27 June 2007
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Posted: 27 June 2007 at 10:10pm | IP Logged Quote Hmuthu


USed power (W)= IV
                      =1.77 135 = 238.95W=0.239kW

Power in kWh= 0.478 kWh for 2 hours

total cost= 0.478 $0.060=$0.02868
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