Division of power:
When combinations of resistances are linked up to the source of voltage, they will draw current. You can simply figure out how much current they will take by computing the total resistance of the combination and then considering network as the single resistor.
If the resistances in network all have identical ohmic value, the power from the source will be distributed evenly among resistances, whether they are linked in series or in parallel. If there are eight identical resistors in series with a battery, the network will consume some amount of power, each resistor bearing 1/8 of the load. If we rearrange the circuit so that the resistors are in parallel, the circuit will dissipate a certain amount of power, but again, each resistor will handle 1/8 of the total power load.