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An electric pump of 0.8 hp is used in wa...

An electric pump of 0.8 hp is used in water supply system in a house.
Calculate the amount of current drawn by it , if it is connected to 220 V power supply.

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The correct Answer is:
To solve the problem of calculating the amount of current drawn by an electric pump of 0.8 HP connected to a 220 V power supply, we can follow these steps: ### Step-by-Step Solution: 1. **Convert Horsepower to Watts**: The power of the pump is given in horsepower (HP). We need to convert this to watts (W) using the conversion factor: \[ 1 \text{ HP} = 746 \text{ W} \] Therefore, for 0.8 HP: \[ P = 0.8 \text{ HP} \times 746 \text{ W/HP} = 596.8 \text{ W} \] 2. **Use the Power Formula**: The relationship between power (P), voltage (V), and current (I) is given by the formula: \[ P = V \times I \] Rearranging this formula to find the current (I), we get: \[ I = \frac{P}{V} \] 3. **Substitute the Values**: Now, we substitute the values we have into the formula. We know: - \( P = 596.8 \text{ W} \) - \( V = 220 \text{ V} \) Thus, \[ I = \frac{596.8 \text{ W}}{220 \text{ V}} \] 4. **Calculate the Current**: Performing the calculation: \[ I = \frac{596.8}{220} \approx 2.71 \text{ A} \] ### Final Answer: The amount of current drawn by the electric pump is approximately **2.71 A**. ---
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Knowledge Check

  • What is the power dissipated by a bulb of 100 W - 220 V connected to a 110 V supply:

    A
    50 MW
    B
    0.5 W
    C
    50 W
    D
    5 MW
  • An electric heater rated 220 V and 550 V is connected to AC mains. The current drawn by it is

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    0.8 A
    B
    2.5 A
    C
    0.4 A
    D
    1.25 A
  • The resistance of the filament of a lamp increases with the increase in temperature. A lamp rated 100 W and 220 V is connected across 220 V power supply. If the voltage drops by 10% , then the power of the lamp will be

    A
    `90 W`
    B
    `81 W`
    C
    between `90 W and 100 W`
    D
    between `81 W and 90 W`
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