Tuesday

November 25, 2014

November 25, 2014

Posted by **Anonymous** on Saturday, October 20, 2007 at 5:45pm.

- science -
**bobpursley**, Saturday, October 20, 2007 at 6:59pmenergy=voltage*current*timeinseconds

where energy is in Joules.

- science -
**Anonymous**, Wednesday, February 27, 2013 at 1:51ama)

Power of the motor P = 3.8hp

= (3.8hp)(746W/hp)

= 2834.8W

Motor is 90% efficient.

Therefore Power absorbed by the motor is (2834.8W)/(0.9) =3150W

But power P = V I

then current in the motor I =(3150W)/(120V)

= 26.25A

(b)

Energy delivered to the motor E = P*t

= (3150W)(4h)(3600s/h)

= 4.536 *107J

(c) E = (3150W)(4h)

=(3.15*4)kWh

=12.6kWh

Therefore cost to run the motor for 4h is(12.6kWh)($0.16/kWh)

= $2.016

**Answer this Question**

**Related Questions**

algebra - The power (P) required to run a motor is equal to the voltage (E) ...

Science - Please help me on my science homework....Motor A uses 1000 joules of ...

physics - A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% ...

physics - A 120-V motor has mechanical power output of 3.20 hp. It is 81.0% ...

science - A 750w motor might also be rated as a 0.5horsepower motor 1 horsepower...

Physics - A 120-V motor has mechanical power output of 2.00 hp. It is 82.0% ...

physics - A box that weighs 725 N is lifted a distance of 20.0 m straight up by ...

Physics - An electric motor has 72 turns of wire wrapped on a rectangular coil, ...

physics - How long will it take a motor 1500 watt motor to lift a 500kg elevator...

physics - A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% ...