64 642
Assignments Done
99,2%
Successfully Done
In September 2018

Answer to Question #11373 in Electric Circuits for saksham

Question #11373
If two bulbs of wattages 25 W and 100 W respectively , each rated at 220 V are connected in series with the supply of 440 V, which bulb will get fused?
Expert's answer
Let's find out the resistances of each bulb from the data given:

R1 = U1^2 / P1 = 220^2 / 25 = 1936 Ohm

R2 = U2^2 / P2 = 220^2 / 100 = 484 Ohm
Let's use P = I^2 * R for each bulb and find out if it is greater than its power rating. The one with higher
power rating will get fused.


P1 = (440 / (1936 + 484))^2 * 1936 = 64 W

P2 = (440 / (1936 + 484))^2 * 484 = 16 W.

Answer: first bulb will get fused (64W > 25W).

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be first!

Leave a comment

Ask Your question

Submit
Privacy policy Terms and Conditions