Question

An electric motor takes 5 A from a 220 V line. Determine the power of
the motor and the energy consumed in 2 h.​

Answer 1

Power Consumption P is given by P = Voltage X Current

The Unit of Power is Watts.

Here Current = 5A

Voltage = 220V

so , Power = Voltage X Current = 220 X 5 = 1100 Watts. = 1.1 Kilo watt

Now , We know that Power = Energy/ time in seconds.

So Energy E = Power X time in seconds .

2 hours = 2 x 3600 seconds = 7200 seconds..

So , the Energy that is being consumed by motor = 1100 x 7200 = 7920 Kilo Joules

Answer 2

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Power (P) is given by the expression,

P = VI

Where,

• Voltage,V = 220 V
• Current, I = 5 A

P= 220 x 5 = 1100 W

• Energy consumed by the motor = Pt

Where,

• Time, t = 2 h = 2 x 60 x 60 = 7200 s
• ˆ´ P = 1100 x 7200 = 7.92 x 106 J
• Therefore, power of the motor = 1100 W
• Energy consumed by the motor =

7.92 x 106 J