Energy Question--(don't know which equation to use?) I don't know how to start the problem, any help or hints would be greatly appreciated. I'm gussing you are supposed to use Ethermal = mCdT but not sure how to apply it to this question. Thanks again!!:-) During 4 hours one winter afternoon, when the outside temperature was 5° C, a house heated by electricity was kept at 23° C with the expenditure of 49 kwh (kilowatt·hours) of electric energy. (a) What was the average energy leakage in joules per second (watts) through the walls of the house to the environment (the outside air and ground)? (b)The rate at which energy is transferred between two systems due to a temperature difference is often proportional to their temperature difference. Assuming this to hold in this case, if the house temperature had been kept at 26° C (77° F), how many kwh of electricity would have been consumed?