Physics
List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.
Current Electricity
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Answer
| Appliance | Power (in kilowatt) | Voltage (V) | Time (t) | Electrical energy (E = P × t) in (kWh) |
|---|---|---|---|---|
| Fluorescent tube | 0.04 | 220 | 6 | 0.24 |
| Television set | 0.12 | 220 | 3 | 0.36 |
| Room heater | 1 | 220 | 2 | 2 |
(i) Energy consumed by fluorescent tube in one day = 0.24 kWh
Hence, energy consumed in 30 days = 0.24 x 30 = 7.2 kWh.
(ii) Energy consumed by television set in one day = 0.36 kWh
Hence, energy consumed in 30 days = 0.36 x 30 = 10.8 kWh.
(iii) Energy consumed by room heater in one day = 2 kWh
Hence, energy consumed in 30 days = 2 x 30 = 60 kWh.
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