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In a house, two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs are lighted for 5 hours every day. Calculate the energy consumed in 30 days.

Answer :

Final answer:

The two 60 W bulbs and three 100 W bulbs consume a total of 59.4 kWh over 30 days, with the calculation based on their individual daily usage and the formula for electrical energy.

Explanation:

To calculate the energy consumed by the electric bulbs in 30 days, we need to use the formula for electrical energy, which is Energy (E) = Power (P) × Time (t). First, we calculate the daily energy consumption for each type of bulb and then multiply by 30 days.

For the two 60 W bulbs lit for 4 hours daily:

Energy consumption per day = P × t = 60 W × 4 hours = 240 Wh/day

Total energy for two bulbs = 240 Wh/day × 2 = 480 Wh/day

For the three 100 W bulbs lit for 5 hours daily:

Energy consumption per day = P × t = 100 W × 5 hours = 500 Wh/day

Total energy for three bulbs = 500 Wh/day × 3 = 1500 Wh/day

Total daily energy consumption for all bulbs = 480 Wh/day + 1500 Wh/day = 1980 Wh/day

Total energy consumption over 30 days = 1980 Wh/day × 30 days = 59400 Wh or 59.4 kWh (since 1 kWh = 1000 Wh)

Therefore, the energy consumed by the bulbs in 30 days is 59.4 kWh.

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Rewritten by : Barada