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Two bulbs A and B are rated 100w-120v and 10w-120v. they are connected across a 120v source in series. which will consume more energy

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by dkavyasri13

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by dkavyasri13

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TO FIND ;-

SOL ;-

Now let us find the resistance of the two bulbs -

Let us find the resistance for the bulb A-

Now we got the resistance for both the bulbs.

To find the series combination , we need to use the below formula to find out it -

= 144 + 1440

So 10 watts bulb consume more energy because uses less power and also the amount o current flowing is less . Remember the formula -

bulb A is rated 100w-120 v

bulb B is rated 10w-120v

required :

solution :

Let's find out the resistances of each bulb from the data given:

R1 = U1^2 /

⇒P1 = 120^2 / 100 = 144 Ohm

R2 = U2^2 / P2 = 120^2 / 10 = 1440 Ohm

P1 = (120 / (144

P2 = (120 / (144 + 1440))^2 * 1440 = 8.2644

Answer: second bulb will consume more energy