1. A student carried out an experiment to investigate the temperature rise of 250 g of a liquid when heated by an electrical immersion heater. The results of the experiment are recorded in Table 1. TABLE 1 (a) (b) Electrical Energy, E (kJ) 0.0 3.7 7.0 10.5 14.5 18.0 Temperature Rise of Water, AT (K) 0.0 3.0 6.0 9.0 12.0 15.0 On the grid provided on page 5, plot the graph of electrical energy, E, against temperature rise, AT. (8 marks) Using your graph, calculate the slope, S, of the graph.​