3.1 power
Every day a certain household uses a 4.4 KW electric stove for 70 minutes, seven 150 W light bulbs for 7
hours each and miscellaneous appliances amounting to 1.8 KW/h. The 4 KW hot water cylinder switches
on for a total of 120 minutes during the day. If electricity cost 50c a KW/h. what is the monthly electricity
bill. (5 marks)

The value is  

Explanation:

From the question we are told that

  The power rating of the stove is  

   The duration of its use everyday is    

    The rating of the light bulbs is

   The number is

   The power rating of the total  bulb is  

    The duration of its use everyday is  

    The power rating of miscellaneous appliance

    The duration of its use everyday is

     The power rating of hot water

      The duration of its use everyday is

Generally the total electrical energy used in 1 month is mathematically represented as

=>  

=>  

=>  

Generally the monthly electricity  bill is mathematically represented as

=>