Appliances in Home
Two rice cookers were used in a 10 day all night long party; a rice cooker which draws a current from 4A from 220V, and another rice cooker which consumes 659W. The electricity bill comes, and the owner dies in shock. Which rice cooker had caused the increase in the owner's electricity bill?
Enter the exact square root of three for the former. Enter the exact pi for the latter.
The answer is 1.73205081.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
The rice cooker which draws a current of 4A from a 220V source has a power consumption of 880W. P=IV =(4A)(220V) = 880W
Now, we can already compare 880W from 659W. To use a precise and systematic way of comparing variables, supposing both rice cookers were used for two hours (two hours to simplify the 10 day all night long party which is 24 hours x 10 = 240 hours)
880W x 2 hours = 17.60kWh 659W x 2 hours = 13.18kWh
Whatever cost per kilowatt the electricity company gives, the higher the computed energy consumed the appliance is, the higher it gives a high electricity bill.
The question requires you to give the exact square root of three: 1.73205081 or simply 1.732