1. The problem statement, all variables and given/known data In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 10.7 oC. The temperature at the inside surface of the wall is 21.4 oC. The wall is 0.17 m thick and has an area of 6.4 m2. Assume that one kilowatt hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall? 2. Relevant equations heat = (thermal conductivity constant x change in temp x area x time)/length 3. The attempt at a solution heat energy to be conducted = 3.6 x10^6J x 10 (1.1 x (21.4-10.1) x 6.4t)/0.17 = 443 x time so equating these gives 3.6 x 10^7 = 443t however this t value is much too large, where have I gone wrong?