A 120. - V motor has mechanical power output of 2.50 hp. It is90.0% efficient in converting power that it takes in by electricaltransmission into mechanical power. (a) Find the current in themotor. (b) Find the energy delivered to the motor by electricaltransmission in 3.00 h of operation. (c) If the electric companycharges $0.110/kWh, what does it cost to run the motor for3.00 h?

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Asked Dec 19, 2019
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A 120. - V motor has mechanical power output of 2.50 hp. It is
90.0% efficient in converting power that it takes in by electrical
transmission into mechanical power. (a) Find the current in the
motor. (b) Find the energy delivered to the motor by electrical
transmission in 3.00 h of operation. (c) If the electric company
charges $0.110/kWh, what does it cost to run the motor for
3.00 h?

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Given Info: The resistance of speaker is 4.00 2. Each channel of system is rated 60.0 W. The maximum current rating of fuse in the speaker circuit is 4.0 A. Explanation: Formula to calculate the maximum current through the stereo is, P. Imax Imax is the maximum current which can flow through stereo circuit, • Pmax is the maximum power delivered to the speaker, • Ris the resistance of the speaker. Substitute 60.0 W for Pmax and 4.00 N for Rin the above equation to find Imax. 60.0 W Imax 4.00 2 = 3.87 A

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