Question

an electric motor takes 5 ampere from a 220 V line. determine the power and energy consumedin 2 hrs

Answer 1

Explanation:

Given :-

Current in the motor = 5 ampere          

Potential difference = 220 V          

Time = 2 hours

To Find :-

The power of the motor and the energy consumed.

Formula to be sued :-

Power of the motor = V × I    

Energy = power × time  

Solution :-

Putting all the values, we get      

Power of the motor = V × I          

Power of the motor = 220 × 5          

Power of the motor = 1100 watt or 1.1 kW  

Hence, the power of the motor is 1100 watt or 1.1 kW.  

Now, Energy = power × time          

Energy = 1.1 kWh × 2 h.          

Energy = 2.2 kWh

Hence, the energy consumed in 2 hour is 2.2 kWh.

Answer 2

GIVEN

• Voltage (V) = 220 V
• Current (I) = 5 A
• Time (t) = 2 h = 2 x 60 x 60 = 7200 s

FORMULA TO BE USED

• P = V × I
• Energy consumed by the motor = P x t

POWER CALCULATION

• P = 220 x 5
• P = 1100 W

ENERGY CALCULATION

• E = 1100 x 7200
• E = 7.92 x 10⁶ J

RESULTS

• Power of the motor = 1100 W
• Energy consumed by the motor = 7.92 x 10⁶ J