Question

an electric heater rated 2kWh is daily used for 2 hrs.if the electrical energy is charged at ₹3 per unit,find the cost of operating the electric heater for 30 days.​

Answer 1

Given:

• Power rating of Electric Heater, P = 2 kW = 2000 W
• Time for which Heater is used daily, t = 2 hrs
• No. of days for which Heater is used = 30 days
• Rate of Electrical energy consumed= 3 Rs/unit

To find:

• Cost of Operating Electric heater for 30 days =?

Formula required:

• Formula to calculate Electrical energy consumed

        E = P × t

[ Where E is electrical energy consumed in Wh, P is power rating W, t is time in hours ]

Solution:

Calculating Electrical energy consumed by Heater in one day

→ Electrical energy consumed in one day = P × t

→ E = 2000 × 2

→ E = 4000 Wh

→ E = 4 kWh = 4 units of energy

Calculating Electrical energy consumed by Heater in 30 days

→ Electrical Energy consumed in 30 days = 4 units × 30

→ E' = 120 units of energy

Calculating Cost of Operating Heater for 30 days

→ Cost of operating heater = 120 × 3  

→ Cost of operating heater = 360 Rs

Therefore,

• Cost of operating Electric heater for 30 days would be 360 Rs.

Answer 2

Answer:

✡ Given ✡

$\leadsto$ An electric heater rated 2kW in daily used for 2 hrs.

$\leadsto$ The electrical energy is changed at Rs 3 per unit.

✡ To Find ✡

$\leadsto$ Find the cost of operating electric heater for 30 days.

✡ Formula Used ✡

$\mapsto$ P = $\dfrac{E}{t}$

✴ E = P × t ✴

✡ Solution ✡

Given:-

• P = 2kW = 2000 W
• t = 2 hrs

▶ According to the question,

$\mapsto$ Electrical energy consumed by heater in 1 days.

$\implies$ E = 2000 × 2

$\implies$ E = 4000 Wh

$\implies$ E = 4kWh

$\mapsto$ Electrical energy consumed by heater in 30 days.

$\implies$ E = 4 × 30

$\implies$ E = 120kWh

▶ Cost of operating electric heater for 30 days

$\implies$ 120 × 3

$\implies$ Rs 360

$\therefore$ Cost of operating electric heater for 30 days is Rs 360.

Explanation:

HOPE IT HELP YOU