Two bulbs are connected in series which bulb will glow brightly

July 20, 2020February 25, 2022 CS Electrical And Electronics

Hello guys, welcome back to my blog. In this article, I will discuss when the two bulbs of different power ratings are connected in series which bulbs will glow more or brightly. Each and everything I will try to explain in a simple way.

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Two bulbs are connected in series which bulb will glow brightly

Guys, as you can see above image where two bulbs of 60 watts and 100 watts are connected in series with 200 volts supply. Now the question is which bulb will glow brighter. We all know that the bulb which dissipates more power will glow brighter (P=I^2 * R).

First, I will calculate the resistance of two bulbs.

Consider 60 watts bulb

P = V^2 / R

R = V^2 / P

= 200^2 / 60

= 666.66 ohm’s

The resistance of the 60-watt bulb is 666.66 ohm’s

Consider 100 watts bulb

R = V^2 / P

= 200 ^2 / 100

= 400 ohm’s

The resistance of the 100-watt bulb is 400 ohm’s

Well, now I will calculate the current flowing through the circuit.

Current,

I = V / R

= 200 / (666.66 + 400)

= 0.18 Amps

Now, I will calculate the power dissipated by both the bulbs. The bulb which dissipates more will glow brighter.

The formula to calculate power dissipation is, P = I^2 * R.

For 60 watt bulb,

P = I^2 * R

= (0.18)^2 * 666.66

= 21.59 watts

For 100 watt bulb,

P = I^2 * R

= (0.18)^2 * 400

= 12.96 watts

Therefore, the bulb which dissipates more power will glow brighter. Thus, the 60-watt bulb will glow brighter than a 100-watt bulb.

I hope this article will help you all a lot. Thank you for reading.

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