There are two types of circuits: series and parallel. in a series circuit, the objects, wires and battery or power source are in a single loop and there is only one path for the electrons to take back to the battery. in a parallel circuit the objects are arranged so that there are several paths back to the battery. this diagram illustrates

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.