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प्रश्न
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.
उत्तर
| Appliance | Power (w) | Voltage (v) | Time (hr) | |
| 1. | Electric fan | 60 | 220 | 1 hr |
| 2. | Refrigerator | 150 | 220 | `1/2` hr |
| 3. | Electric iron | 700 | 220 | `1/2` |
| Total | 220, v |
Energy consumed = 30 × `[(60/1000 xx 1) + (150/1000 xx 1/2) + 0.35]`
= 14.55 kwH
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