Question

What is the power of an electric motor when it consumes energy of 9x10^3J in 3 s?
A. I hp
B. 2 hp
C. 3 hp
D. 4 hp​

Answer 1

Answer:

[D]. 4hp

Explanation:

The mechanical energy of an electric motor is calculated by multiplying the speed by the torque. With one watt equating marginal one joule per sec or one Newton-Meter per second, mechanical power is commonly expressed in terms of kilowatts (kW) or horsepower (hp). Work is completed in one time period per horsepower.

The power an engine generates is referred to as horsepower. It is determined by the amount of force required to move 550 pounds one foot in a second or 33,000 pounds one meter in a minute. The speed at which the work is completed serves as a measure of power.

$work done=9*10^{3}$

                $=9*1000$

                $= 9000J$

the electric motor's power

$power=\frac{work}{time}$

          $=\frac{9000}{3}$

          $= 3000 watt$

Consequently, the electric motor has a $3000watts$ output.

$3000 watts = 4 hp$

#SPJ2

Answer 2

Answer:

D. 4hp

Explanation:

An electric motor's mechanical energy is computed by dividing the speed by the torque. Mechanical power is typically stated in terms of kilowatts (kW) or horsepower, with one watt roughly equaling one joule per second or one Newton-Meter per second (hp). Per horsepower, a time period is required to do the work.

Horsepower is the name for the power an engine produces. The amount of power needed to move 550 pounds one foot in a second or 33,000 pounds one metre in a minute serves as the yardstick. A measure of power is the rate at which the work is finished.

power = work/time

power = 9000/3

power = 3000watt

3000watt = 4hp

so the correct answer is 4 hp

#SPJ2