Power and Energy Consumed by Electric Motor
Given:
- Current, I = 5 A
- Voltage, V = 220 V
- Time, t = 2 hours
To find:
- Power of the motor, P (in watts)
- Energy consumed, E (in joules or kilowatt-hours)
Step 1: Calculate power using formula
Power, P = V × I
P = 220 V × 5 A = 1100 W
Step 2: Calculate energy consumed
Energy, E = Power × time
Convert time to seconds: t = 2 h = 2 × 3600 = 7200 s
E = 1100 W × 7200 s = 7,920,000 J
Or in kilowatt-hours:
E = 1100 W × 2 h = 2200 Wh = 2.2 kWh
Power of the motor = 1100 W
Energy consumed in 2 hours = 7.92 × 106 J or 2.2 kWh
Energy consumed in 2 hours = 7.92 × 106 J or 2.2 kWh