Question

10 bulbs each of 100W, 10 fans each of 50W, 5 computers of 200W are used for 8 h each day. How much will be the cost of electricity per day considering rate of ₹ 6 per unit.

Answer 1

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✤ Required Answer:

✒️ GiveN:

• 10 bulbs each of 100W, 10 fans of 50W each and 5 computers of 200W each are inside the house.
• They work for 8 hours per day.
• Cost of 1 unit of electricity = Rs. 6

✒️ To FinD:

• Cost of electricity per day /Rs.6

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✤ How to solve?

Here, the Electric energy produced or consumed per unit time is called Electric power. So, If we multiply the time with Electric power, we will get Electric energy. So, It is given by:

$\large{ \cdot{ \boxed{ \rm{U = P t}}}}$

Here,

• U = Electric energy
• P = Power consumed
• t = Time taken

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✤ Solution:

We have,

• 10 bulbs of 100W for 8 hours.
• 10 fans of 50W for 8 hours
• 5 computers of 200W for 8 hours

Finding individual energy consumed/day,

• 1 BULB

➝ P = 100 W/1000 = 0.1 kW

➝ U = Pt

➝ U = 0.1 kW × 8 hours

➝ U = 0.8 kWh

• 1 FAN

➝ P = 50W/1000 = 0.05 kW

➝ U = Pt

➝ U = 0.05 kW × 8 hours

➝ U = 0.4 kWh

• 1 COMPUTER

➝ P = 200W/1000 = 0.2 kW

➝ U = Pt

➝ U = 0.2 kW × 8 hours

➝ U = 1.6 kWh

Now, Finding total energy consumed in a day,

• No. of Bulbs = 10
• No. of fans = 10
• No. of computers = 5

❍ Total energy ➤

➝ 10 × 0.8 kWh + 10 × 0.4 kWh + 5 × 1.6 kWh

➝ 8 kWh + 4 kWh + 8 kWh

➝ 20 kWh

❍ Cost of electric energy/day,

➝ Rs. (20 kWh) × 6

➝ Rs. 120

⚡Cost of Electric energy that day: Rs. 120

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Answer 2

Answer:

the answer is 8952 rupees

Explanation: