Question

A 2kw, 40 litres water heater is switched on for 20 minutes. The heat capacity cp for water is 4.2 kj/kg k. Assuming all the electrical energy has gone into heating the water, increase of the water temperature in degree centigrade is select one:



a. 25.25



b. 2.7



c. 4.0



d. 14.3

Answer 1

a. 2.7 is right answer

Answer 2

Answer:

14.28

Explanation:

Pxt=mxcx∆t