I have attached the question as a word file, along with the answers. I didnt understand 2 parts: 1. The bit about which part of the circuit will transfer energy to surroundings. What is Ss, there is only S1 and S2. Also, why is that the answer? 2. When approximating a value for R Time constant = 200 is taken. Why is this? Time constant is the time it takes for something to decay to 37% of its original value, or increase to 63% if it is an increasing curve. Over here, 200s is the time taken for the TOTAL. Not the time constant??