Question

The mechanical power output of an electric motor is 3.30 hp. The motor is connected to a 120 V source and is 87.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Determine the following. (a) current (in A) delivered to the motor A (b) energy (in MJ) delivered to the motor by electrical transmission in 2.40 h of operation MJ (c) the cost to run the motor (in dollars) for 2.40 h, if the electric company charges $0.110/kWh $

          The mechanical power output of an electric motor is 3.30 hp. The motor is connected to a 120 V source and is 87.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Determine the following.
(a) current (in A) delivered to the motor
A
(b) energy (in MJ) delivered to the motor by electrical transmission in 2.40 h of operation
MJ
(c) the cost to run the motor (in dollars) for 2.40 h, if the electric company charges $0.110/kWh
$

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The mechanical power output of an electric motor is 3.30 hp. The motor is connected to a 120 V source and is 87.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Determine the following.
(a) current (in A) delivered to the motor
A
(b) energy (in MJ) delivered to the motor by electrical transmission in 2.40 h of operation
MJ
(c) the cost to run the motor (in dollars) for 2.40 h, if the electric company charges 0.110/kWh

Added by Jennifer D.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Hubert Agamasu

02/08/2024

Step 1

Given that the mechanical power output of the motor is 3.30 hp, we need to convert this to watts. 1 hp is equal to 746 watts. Therefore, the electrical power input to the motor = 3.30 hp * 746 watts/hp = 2461.8 watts = 2.4618 kW. Show more…

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(a) Current (in A) delivered to the motor A (b) Energy (in MJ) delivered to the motor by electrical transmission in 2.40 h of operation MJ (c) The cost to run the motor (in dollars) for 2.40 h, if the electric company charges $0.110/kWh The mechanical power output of an electric motor is 3.30 hp. The motor is connected to a power supply for 2.40 h.

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