A current of 2A flows through a bulb of resistance 480ohms for 8hours in a day. An electric heater draws a
current of 5A when connected to a 240V supply for 2hours daily and an electric iron of resistance 2000ohms is
connected across a voltage source of 240V for 10 hours daily. Calculate the cost of electricity at the rate of Rs.
8per unit for the month of October.
Answers
Answer:
12th
Physics
Current Electricity
Electric Energy and Power
A 100W electric bulb is lig...
PHYSICS
A 100W electric bulb is lighted for 2 hrs daily and four 40 Watt bulbs are lighted for 4 hrs everyday. Calculate the energy consumed in kWh in 30 days.
MEDIUM
ANSWER
Energy = Power*time
Energy consumed by 100 W bulb per day = 2∗100 Wh
= 0.2 kWh
Energy consumed by 40 W bulbs per day = 4∗40∗4 Wh
= 0.64 kWh
Total energy consumed per day = 0.2 + 0.64 kWh
= 0.84 kWh
Therefore, the energy consumed in 30 days = 30∗0.84 kWh
= 25.2 kWh