Question

An electric heater draws a current of 10 a from a 220v aupply.what is the cost of using the heater 5 hours per day for 30 days if the cost of 1 unit is 2.50

Answer 1

Power consumed by electric heater = voltage*current
                                                         = 220*10 
                                                         = 2200 watt = 2.2kW     [1 watt = 1V-A]
As 1 unit = 1kWh
Therefore, the heater produces heat per unit hour = power*time
                                                                                = 2.2*1
                                                                                = 2.2 kWh

If heater is used for 5 hours a day, then it produced = 2.2*5 kWh heat
                                                                                   = 11 kWh
If it is working for 30 days, then   = 11*30 
                                                     = 330 kWh

Cost of 1 unit (1 kWh) = Rs.2.50
Then for 330 unit. the total cost will be = Rs.330*2.50
                                                             = Rs. 825.00
Hoping for the brainliest answer!