11 You are measuring electricity consumption by various end

1.1 You are measuring electricity consumption by various end uses in a building. The sensors you use to make the measurements are accurate to about 1% of the reading. You are able to measure the following items separately and find that . The telephone system uses 20 W . The lights use 10.3 kW The computers and office equipment use 15.4 kW The HVAC system uses 45 kW

Solution

Solution :

The total consumtion is got by adding all the individual consumtions together

45+15.4+10.3+0.02 = 70.72 KW .

There are two significant figures in the answer.