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Answer :
Final answer:
The energy consumed by a 220-volt 100-watt bulb used for 9 hours a day over a month of 30 days is 27 kilowatt-hours (kWh) or 27 units of electricity.
Explanation:
To calculate the energy consumed by a 220-volt 100-watt bulb used for 9 hours a day over a month of 30 days, we multiply the power rating by the number of hours used each day and then by the number of days in the month.
The power rating is 100 watts or 0.1 kilowatts (kW), and the bulb is used for 9 hours a day for 30 days.
So, the energy consumed in a month is calculated as:
Energy (kWh) = Power (kW) × Usage Time (hours per day) × Number of days in a month
Energy (kWh) = 0.1 kW × 9 hours/day × 30 days
= 27 kWh
The bulb consumes 27 kilowatt-hours (kWh) of energy in a month. This measurement of energy is commonly referred to as 'units' on residential electricity bills, where one unit is equal to one kWh.
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