Question

An electric motor take 5 amperes current from a 220 volts supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.

Answer 1

Answer:

Power of the motor = 1100 Watt

Electrical energy consumed by it in 2 hours = 2.2 kw-h

Explanation:

As per the given data of question,we have,

Voltage supplied = 220 volts

Current supplied = 5 amperes

Time = 2 hours

As we know that,

Power = voltage × current

so,

⇒ Power = 220 × 5 = 1100 Watt

∴ Power of the motor = 1100 Watt

Also,

Electrical energy consumed is expressed in K-watt-hour.

Therefore,

Energy consumed = power × time

⇒ Energy consumed = 1100 watt × 2 hours = 2200 watt-hour

Since,

1 k-watt = 1000 watt

∴ Electrical energy consumed by it in 2 hours = 2.2 kw-h

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