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A bulb is rated at 330v- 110w. what do you think is its resistance? three such bulbs burn for 5hrs at a stretch. what is the energy consumed? calculate the cost in rupees if the rate is 70 paise per?
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A bulb is rated at 330v- 110w. what do you think is its resistance? th...
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A bulb is rated at 330v- 110w. what do you think is its resistance? th...
Calculation of Resistance

Using the formula P=V²/R, we can calculate the resistance of the bulb as:

R = (V²/P) = (330²/110) = 990 ohms


Calculation of Energy Consumed

Energy consumed by one bulb in 5 hours can be calculated using the formula:

Energy = Power x Time

Energy = 110W x 5 hours = 550 watt-hours

Energy consumed by three bulbs in 5 hours is:

Total Energy = 550 x 3 = 1650 watt-hours or 1.65 kWh


Calculation of Cost

Cost of electricity can be calculated using the formula:

Cost = Energy x Rate

Given rate is 70 paise per unit or kWh. Converting paise to rupees, it becomes 0.7 rupees per kWh.

Cost of electricity consumed by three bulbs in 5 hours is:

Cost = 1.65 x 0.7 = 1.155 rupees


Summary


  • Resistance of the bulb = 990 ohms

  • Energy consumed by one bulb in 5 hours = 550 watt-hours

  • Energy consumed by three bulbs in 5 hours = 1.65 kWh

  • Cost of electricity consumed by three bulbs in 5 hours = 1.155 rupees

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A bulb is rated at 330v- 110w. what do you think is its resistance? three such bulbs burn for 5hrs at a stretch. what is the energy consumed? calculate the cost in rupees if the rate is 70 paise per?
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