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