Induction cooking based on power electronics is estimated to

Induction cooking based on power electronics is estimated to be 80% efficient
compared to 55% for conventional electric cooking. If an average home consumes
2 kW-hrs daily using conventional electric cooking, and that 20 million households
switch to induction cooking in the United States, calculate the annual savings in
electricity usage.

Solution

Conversational averages power consumption is 2kwhr

Now induction cooking is 80 percentage efficient of 55 percentage of conversational power

Induction is 2*0.55*0.80=880w hr only

Average 20 million power = 20*10^6*880=17600 mega wat hr

If conversational cooking used for 20 millions is =40000 mega watt hr

Saving is 40000-17600

22400 mega wat hr