Question

a small electric motor is used to raise a weight of 2N through a vertical height of 80cm in 4 seconds. The efficiency of the motor is 20%. What is the electrical power supplied to the motor.​

Answer 1

Answer:

I don't know sorry!!!!!!!!!!!!!!!!!!!

Answer 2

Concept

An electrical device known as an electric motor transforms electrical energy into mechanical energy

Given

• Electric Force = 2N
• Height = 80cm
• Time= 4Sec
• Efficiency=20%

Find

We need to find Electric Power

Solution

We know that Energy =Mgh

Power = Energy / Time

Let us calculate the energy first ,

Energy = 2*0.8*10

Energy= 2*8

Therefore ,

Energy = 16 J

Now Let us calculate the Power

Therefore,

Power = 16/4

Therefore

Power = 4J/s

Now let us calculate the output

Enery / Power * Efficiency

= 16/4*20%

=0.8W

Hence the electrical power supplied to the motor is 0.8W

#SPJ2