Series and Parallel Sources
. Sources of electric current can also be connected in various ways. Sources can be arranged in series by connecting a terminal of one source to the opposite terminal of the next source. For example, if the positive terminal of battery A is connected to the negative terminal of battery B, and the positive terminal of battery B to the negative terminal of battery C, then batteries A, B, and C are in series. The load is then placed between the positive terminal of battery C and the negative terminal of battery A. When sources of electric current are connected in series, their total voltage is equal to the sum of their individual voltages. For example, three 1.5-volt batteries connected in series furnish a total of 4.5 volts. If the load is 9 ohms, the batteries send a current of 4.5/9 = 0.5 amp through the load. Current sources may be arranged in parallel by connecting all the positive terminals together and all the negative terminals together. The load is then placed between the group o