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Write commercial and SI units of energy. Calculate the cost of electric energy consumed by an electric heater rated with 50 W used for 2 hours daily in the month of April. The cost of one unit of electric energy is Rs. 5.

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### Step-by-Step Solution: 1. **Identify the Units of Energy**: - The SI unit of energy is **Joules (J)**. - The commercial unit of energy is **Kilowatt-hour (kWh)**. 2. **Relationship Between Units**: - To express large quantities of energy, we use kilowatt-hour. The relationship is: ...
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