Question

Calculate the amount of power of an electric motor which consumes
energy of 100 Joules in 20 minutes.

Answer 1

Answer:

1 / 12 W ( or ) 0.83 W ( approximately )

Explanation:

Given,

Energy ( E ) = 100 J

Time ( t ) = 20 minutes

             

To find : Power ( P ) = ?

t = 20 minutes

 = 20 x 60

t = 1200 seconds

Formula : -

E = P x t

P = E / t

  = 100 / 1200

P = 1 / 12 W

    ( or )

P = 0.83 W ( approximately )

1 / 2 W ( or ) 0.83 W is the amount of power of an electric motor which consumes energy of 100 Joules in 20 minutes.

Answer 2

Given :

• Energy of an electric motor = 100 Joules
• Time = 20 min

To find :

• Power of the electric motor

Solution :

Firstly, we will convert the time from minutes to second.

Time = 20 minutes

As we know,

1 min = 60 seconds

Multiply the given value by 60 to convert the time from minutes to seconds.

$\qquad \longmapsto \tt{20 \times 60} \\ \\ \qquad \longmapsto \tt 1200 \: seconds \\ \\ \qquad \longmapsto \tt time \: = 1200 \: seconds$

Using formula,

$\underline{ \boxed{ \sf power = { \dfrac{energy}{time}}}}$

Substituting the given values,

$\quad \longmapsto \tt{power = \dfrac{100}{1200}} \\ \\ \quad \longmapsto \tt power = \dfrac{1 \not0 \not0}{12 \not0 \not0} \\ \\ \qquad \longmapsto \tt power = \dfrac{1}{12}$

Power of an electric motor = $\tt\dfrac{1}{12}$ W or 0.083 W.