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CBSE Class 10 Answered

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 | 10 Jul, 2011, 04:32: AM
answered-by-expert 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 | 11 Jul, 2011, 10:16: PM

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