Question

An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. Calculate:
(i) the current drawn,
(ii) the electrical energy consumed in 60 hours,
(iii) the cost of electrical energy consumed at Rs. 2.50 per kWh.

Answer 1

(i) Since, W = V × i, But given that W = 1500, V = 250

Current, i = ${\displaystyle \frac{\text{W}}{\text{n}}}$

${\displaystyle =\frac{1500}{250}=6}$ amperes

(ii) Energy consumed in 60 hours 

${\displaystyle =\frac{\text{Watts}\times \text{hours}}{1000}}$ kWh

${\displaystyle =\frac{1500\times 60}{1000}=90}$ kWh

(iii) Cost of 90 kWh at Rs. 2.50/kWh = Rs. 90 × 2.50 = Rs. 225.00.