Bulb Wiring in Series and Parallel Connection


Hey, in this article we are going to see a bulb wiring diagram. There are some different places or applications where we need to connect bulbs either in parallel connection or in series connection. So, we must know how to connect properly. In fact, we will learn about the current, power consumption, and other important factors.


Bulb Wiring in Series Connection


The bulb has two terminals for AC we can consider it as - Phase and Neutral. So when the Neutral terminal of the first bulb is connected to the neutral terminal of the second bulb and as same, all the bulbs are connected like that then this connection will be called a Series Connection. Here, you can see the wiring diagram of bulbs in series.

Bulb Wiring in Series Connection, Bulb Connection Diagram


Here, you can see the neutral terminal of the first lamp is connected to the phase terminal of the second lamp and the neutral terminal of the second lamp is connected to the phase terminal of the third lamp. Here, we have shown a 100W lamp, an 80W lamp, and a 60W lamp.

Now the question is in the series connection which bulb will glow brighter. Remember that the brightness of the bulb depends upon its power consumption. More power consumption means more brightness. In the series connection, the current flow is the same or equal through all the bulbs. And the power dissipation by the bulb depends upon the internal resistance of the bulb and the flow of current through the bulb. For a rated input voltage, the resistance of the low wattage bulb will be more than the high wattage bulb, it can be measured by,

R= V^2/P  or  I = V/Rs

So, in the series connection as the low wattage bulb has higher power dissipation, it will glow brighter.

So, according to the above diagram, the 60-watt bulb will be glow with the most brightness and the 100-watt bulb will be glow with less brightness.


Bulb Wiring in Parallel Connection


When the phase terminal of all the bulbs are connected together and the neutral terminal of all the bulbs are connected together then it will be called the parallel connection. Here, you can see the wiring diagram of bulbs in parallel.

Bulb Wiring in Parallel Connection, Bulb Wiring Diagram, Bulb Connection Diagram


In a parallel connection, the voltage across all the bulbs is equal to the supply voltage. But the current flow through them is different. In the parallel connection, the highest wattage bulb will glow with more brightness as it dissipates more power. So according to the above diagram, the 100watt bulb will glow with the highest brightness while the 60watt bulb will glow with the lowest brightness.


Bulb Connection with Switch


When you connect a bulb with a switch the phase terminal of the bulb is to be connected to anyone terminal of the switch. The another terminal of the switch is to be connected to the phase terminal of the power source. The neutral terminal of the bulb is to be directly connected to the neutral terminal of the power source. Here, you can see the wiring of a bulb with a switch.

Bulb Connection with Switch, Bulb and Switch Connection



Series Bulb Connection for Testing


Here, you can see the diagram for a series bulb connection for testing.

Series Bulb Connection for Testing


The connection is very simple, you just need to connect a socket or outlet instead of a switch in series with the lamp. You can connect the two leads of the equipment is to be tested to this socket or outlet.


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Bulb Wiring in Series and Parallel Connection Bulb Wiring in Series and Parallel Connection Reviewed by Author on 3/21/2022 Rating: 5
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