Series Circuit
A series circuit has only one path for the electric current to pass through. In this circuit, electricity passes through a set of loads connected in series or in a straight line.
In the figure above, each of the three dry cells has a voltage of 1.5 volts (V). In a series connection, the total voltage across the circuit is equal to the sum of the voltages of all dry cells. Hence, the total voltage across the circuit is: 1.5 V + 1.5 V + 1.5 V = 4.5 V. The bulb will glow brightly because it receives a great amount of electric current from the three dry cells.
When bulbs are connected in a series, electric current flows only in one direction; that is, from the dry cell to the first bulb, then to the second bulb and the third bulb, and finally back to the source. If a single load is loosened or damaged, the rest of the loads will not function because the circuit is cut or open. For example, Christmas lights are connected in a series.
