Question

A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. Calculate:

1. The current drawn,
2. The energy consumed in 50 hours, and
3. The cost of energy consumed at ₹ 4.20 per kWh.

Answer 1

Given, 

Power of geyser, P = 1500 W

Voltage, V = 250 V

1. Current, I = `"P"/"V"`
   I = `1500/250`
   = 6 A
2. Time, t = 50 h
   Energy, E = P × t
   = 1500 × 50
   = 75000 Wh
   = 75 kWh
3. Cost per unit of energy = Rs 4.20
   Cost for 75 kWh of energy = 4.20 × 75
   = ₹ 315