chain of 12 identical christmas tree lights connected in series is to be placed across a 120 v source of emf each light should dissipate 15w what resistance must each of the light bulbs have?

Asked by  | 10th Jul, 2011, 04:32: AM

Expert Answer:

Let the resistance of each bulb be R.
 
Equivalent resistance, Rs = 12R
 
Current in the circuit, I =
 
Since all bulbs are connected in series, same current (I) flows through each bulb.
 
Therefore, Power used in each bulb, P = I2R
 
                                                  

Answered by  | 11th Jul, 2011, 10:16: PM

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