The mechanical power output of an electric motor is 3.10 hp. The motor is connected to a 120 V source and is 89.0% 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 3.70 h of operation
MJ
(c)
the cost to run the motor (in dollars) for 3.70 h, if the electric company charges $0.110/kWh
$