Question

(01)
in a household, five tubelights of 40 Weach are used for five hours and an electric press of
500 W for four hours everyday. Calculate the total electrical energy consumed by these
arpliances in a month of 30 days @ Rs. 5.00 per kwh.​

Answer 1

Given

• There are 5 tubelights of 40 W each
• Time₁ = 5 hours
• Electric press of 500 W
• Time₂ = 4 hours
• Cost per unit = ₹5

To Find

• Electric Bill

Solution

● E = P × t

✭ Electrical Energy consumed by the tubelights :

→ E = P × t

• Power = 40 W = 40/1000 = 0.04 kW
• Time = 5 hours

→ E = 0.04 × 5

→ E = 0.2 kWh

☯ In 30 days,

• 30 × 0.2 = 6 kWh

━━━━━━━━━━━━━━━━━━━━━━━━━

✭ Electrical Energy consumed by the Press :

→ E = P × t

• Power = 500 W = 500/1000 = 0.5 kW
• Time = 4 hours

→ E = 0.5 × 4

→ E = 2 kWh

☯ In 30 days,

• 30 × 2 = 60 kWh

━━━━━━━━━━━━━━━━━━━━━━━━━

✭ Current Bill :

→ Bill = Cost per unit × Total Energy Consumed

→ Bill = 5 × (60+6)

→ Bill = 5 × 66

→ Bill = ₹330

∴ The current bill for a month of 30 days would be ₹330

Answer 2

Given:-

•In a household , five tubelights of 40 Weach are used for five hours and an electric press of 500 W for hours every day

•Total energy consumed by these appliances in a month of 30 days is Rs. 5.00 per kwh$\:$

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To Prove:-

•Calculate the total electrical energy consumed by these appliances in a month of 30 days @ Rs, 5.00 per kwh.(Electric bill)

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Solution:-

•To find the Electric bill We have to find electric energy consumed by the press..

✮ Electric bill consumed by the press..

Using formula,

✮ E = P × T

✮ E = 0.5 × 4

✮ E = 2 kWh

✮Electric bill consumed by the press is 2kWh.

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The electric bill consumed by the press in 30 days..

✮ No of days × electric bill consumed by the press

✮ 30 × 2 = 60 kWh

✮ Electric bill consumed by the press in 30 days is 60kWh.

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✮ Electric bill..

✮ Cost per unit × Energy consumed in 30 days

✮ 5 × ( 60 + 6 )

✮ 5 × 66 = 330 Rs.

The electric bill for a month of 30 days is Rs 330

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