We have the right to connect the bulbs in the series or parallel according to the wanted application. The luguys of the bulb depends on the current flowing with the bulb aspect. The heating effect relies on the present and also the resistance of the bulb. The warm produced by the bulb is proportional to the product of the square of the present and also the resistance.

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Current with series bulbs is;

I = 2V/(R+R) = 2V/2R = V/R

Thus, the present through each bulb is equal to bulb rated current, and both the bulb will certainly glow with the same brightness.

This form of series lamp connection is supplied to meacertain 440 volts line to line voltage.

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Caution:

Both the bulbs must be of the very same voltage 220 volts and the power of the bulb must be the exact same. In the case of different power ratings, the reduced wattage bulb will certainly explode as a result of even more heating than its rated capacity and it might reason accidents.

Case 3- When nonidentical rating bulbs are associated in the series 

 

Resistance of Bulb 1 is ;

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Resistance of Bulb 2

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From over, it is clear that R2 >R1

The current circulation with both the series-linked bulbs is the same. 

The warmth generated in bulb-1 is;

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The heat created in bulb-2 is;

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From over H2>H1, therefore the bulb 2 will glow brighter than bulb 1.

General Rule

When we attach 2 bulbs or even more than two bulbs in the series, the bulb which has actually reduced power rating have more resistance and it will glow brighter.

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Example:

Two bulbs of power rating 50- watt and also 100-watt, 220 volts are associated in the series and fed 220 volts. Which bulb will certainly glow brighter?

Resistance of 50-Watt bulb

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Resistance of 100-watt bulb

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The full resistance of the series circuit (R)

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The total present in the circuit (I)

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The current flowing via both series-linked bulbs will certainly be the same. 

The power dissipated by a 50-watt bulb

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The power dissipated by a 50-watt bulb

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From above, it is clear that a 50 watts bulb draws more power than a 100-watt bulb.

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Therefore, a 50-watt bulb will glow brighter than a 100-watt bulb once linked in the series.