The electric heater rated 800 watt oparates 6 our \ day find the cost of energy two opporate it for 30 days at 3.00 per unit
Answers
Correct Question:
The electric heater rated 800 watt which is operated 6 hours per day. Find the cost of energy to operate it for 30 days at Rs. 3 per unit.
Solution:
Firstly we will find the total time for which heater is used.
=> Electric heater used in 1 day=6 hrs.
=> Electric heater used in 30 days=30×6 hrs.
=> Electric heater used in 30 days=180 hrs.
Since S.I. unit of electric energy is Kilowatt hrs,
Convert the given power of electric heater in kilowatts.
=> 1000 watt=1 Kilowatt
=> 1 watt=1/1000 kilowatt
=> 800 watt=1/1000×800 kilowatt
=> 800 watt=0.8 kilowatt
Now we have formula for electric energy:
=> Energy= Power×Time
=> Energy= 0.8 kilowatt×180 hrs.
=> Energy=144 kilowatt.hr
=> Energy=144 kWh
=> Energy=144 units [1 kWh=1 unit]
Now we will find cost of energy consumption.
=> Cost of 1 unit energy=Rs. 3
=> Cost of 144 units energy=Rs.3×144
=> Cost of 144 units energy=Rs. 432
So the required cost of energy consumption by heater is Rs.432.