Geetha uses three electrical devices at home: two 20-watt tube lights for eight hours, two 50-watt fan for eight hours, and one 300-watt fridge for 24 hours in a day. Calculate the electricity bill amount for a month of 31 days. (Given that the cost of electricity is 2 rupees per unit).
Question
Geetha uses three electrical devices at home: two 20-watt tube lights for eight hours, two 50-watt fan for eight hours, and one 300-watt fridge for 24 hours in a day. Calculate the electricity bill amount for a month of 31 days. (Given that the cost of electricity is 2 rupees per unit).
Solution
Sure, here's how you can calculate the electricity bill:
Step 1: Calculate the daily usage of each device in kilowatts:
- Tube lights: 2 * 20 watts * 8 hours = 320 watt-hours = 0.32 kilowatt-hours (kWh)
- Fans: 2 * 50 watts * 8 hours = 800 watt-hours = 0.8 kWh
- Fridge: 1 * 300 watts * 24 hours = 7200 watt-hours = 7.2 kWh
Step 2: Add up the daily usage to get the total daily usage:
Total daily usage = 0.32 kWh + 0.8 kWh + 7.2 kWh = 8.32 kWh
Step 3: Calculate the monthly usage by multiplying the daily usage by the number of days in the month:
Monthly usage = 8.32 kWh/day * 31 days = 257.92 kWh
Step 4: Calculate the cost by multiplying the monthly usage by the cost per unit:
Cost = 257.92 kWh * 2 rupees/kWh = 515.84 rupees
So, the electricity bill for the month would be 515.84 rupees.
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