

Ohm's Law teaches us that Voltage is equal to the product of resistance and current. This is fine if we have a circuit as simple as a single light run by a battery. But how often do we truly encounter a circuit which has only one resistance? It is actually quite seldom. Most circuits have many resistances in various combinations. So we must learn how to mathematically deal with all these resistances. Fortunately, combined resistances can only be configured in two ways: Resistances Combined in Series Resistances Combined in Parallel First, let us describe the difference between a SERIES circuit and a PARALLEL circuit. A SERIES circuit is hooked together like a chain, with each link connected to the link before it. If any given link in the chain is broken, the whole chain is broken, and doesn't work. 






As I said before... it's as easy as 2+2. If two or more resistors are connected end to end, as in a chain, we say that they are in series. To find out the TOTAL RESISTANCE of resistors in series, all we have to do is add up their individual values. It's that simple. If we have 3 resistors, (R1, R2, and R3) each with a value of 2 W, the total resistance (RT) of the series circuit would be 2+2+2, or a total of 6 W. Hence, 

