If two bulbs of 40 watts and 60 watts are connected in series why will the 40 watt bulb glow more than the 60 watt bulb?
Because 40 watt bulb consumes less power than 60 watt bulb The current draw across the 40 watt bulb is now higher because of the 60 watt bulb wired in series with it. This will shorten the life of the 40 watt bulb, use two 60 watt bulbs in series with no problems.
When connecting electrical loads in series, the current through the circuit is the same. When connecting electrical loads in parallel, the voltage across the different paths is the same. So let's use a few equations to help us out.
Remember, in series the current flowing through both bulbs is the same (since there is no other path for the current to take except through both bulbs). So both bulbs will glow with the same intensity. The situation changes when we place the bulbs in parallel.
The voltage applied to each bulb is the same, but the 100W bulb offers less resistance. Since the voltage is the same for each bulb, but the resistance is lower for the 100W bulb, more current will flow through it. Hence, the 100W bulb will glow brighter than the 60W bulb.
When connecting the two bulbs in series, their resistance is added together. The effect is that for each load (light bulb) you add in parallel, the overall resistance of the entire circuit is decreased. That means more current will flow out of power source in a parallel circuit versus a series circuit.
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