Question

an electric geyser rated 1500w, 250v, is connected to a 250v line mains. calculate
a) the electric current drawn by it b) energy consumed by it under 50 hours
c) cost of energy consumed if each unit costs 6. 00 rs.

Answer 1

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Power = 1500W , Voltage (V) = 250V

(i) Current drawn = P/V

=> 1500/250 = 6A

(ii) Energy consumed = power × time = 1500 × 50 = 75000Wh [ 1 kW = 1000W]

=> 75unit [ 1 unit = 1kWh]

(iii) cost of energy consumed = 75 × 6 = Rs 450

Answer 2

Given:

• Power rating : 1500 W/250 V
• It is connected to 250 V line
• Time for which operated = 50 hr
• Cost @ ₹ 6 per unit

To find:

• Current
• Total energy consumed
• Total cost

Calculation:

Current will be :

$P = V \times i$

$\implies i = \dfrac{P}{V}$

$\implies i = \dfrac{1500}{250}$

$\implies i = 6 \: ampere$

Now, the net energy consumed is :

$E = P \times t$

• Putting P value in kW hr (i.e 1.5 kW hr) unit :

$\implies E = 1.5 \times 50$

$\implies E = 75 \: kW \: hr$

Now , net cost will be :

$net \: cost = 75 \times 6$

$\implies net \: cost = Rs \: 450$

So, net cost is ₹ 450/-