electricity question bank for term 2

  a. It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the 

Main Electricity Board. His generator has a maximum power of 2.0 kW. 

The generator produces energy at this maximum power for 3 hours. 

Calculate how much it would cost to buy the same amount of energy from 

the Main Electricity Board.(1 Mark)

b. A student boils water in an electric kettle for 20 minutes. Using the same 

mains supply he wants to reduce the boiling time of water. To do so should 

he increase or decrease the length of the heating element? Justify your 

answer.(2 Marks)