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Standard VII

Physics

Domestic Electric Circuit

Five 100 W bu...

Question

Five $100 W$ bulbs are used for $10 hr$ every day for $30 days$ . If the rate of electricity is $Rs. 4.00 / unit$ , find the cost of electricity.

Rs. 300

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Rs. 600

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Rs. 450

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Rs. 900

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Solution

The correct option is B $Rs. 600$
For each bulb, power, $P = 100 W = 0.1 kW$

So, total energy used by five bulbs,
$E = 5 \times 0.1 \times 10 \times 30 = 150 kWh = 150 unit$

So, cost of electricity $= 150 \times 4 = Rs. 600$

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Five 100 W bulbs are used for 10 hr every day for 30 days. If the rate of electricity is Rs. 4.00/unit, find the cost of electricity.

The correct option is B Rs. 600For each bulb, power, P=100 W=0.1 kW So, total energy used by five bulbs, E=5×0.1×10×30=150 kWh=150 unit So, cost of electricity =150×4=Rs. 600

Five $100 W$ bulbs are used for $10 hr$ every day for $30 days$ . If the rate of electricity is $Rs. 4.00 / unit$ , find the cost of electricity.

The correct option is B $Rs. 600$
For each bulb, power, $P = 100 W = 0.1 kW$

So, total energy used by five bulbs,
$E = 5 \times 0.1 \times 10 \times 30 = 150 kWh = 150 unit$

So, cost of electricity $= 150 \times 4 = Rs. 600$