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CBSE Class 10 Answered

a 6V - 12W lamp is connected in series with a source of 12 V supply. calculate the value of the resistance R for the proper working of the lamp. what is the current flowing through the circuit.
Asked by Sneha Barnwal | 24 May, 2013, 06:23: PM
answered-by-expert Expert Answer
P = 12W and V = 6V
Hence P = V^2/R
R = V^2/P = 36/12 = 3 ohms
 
Now, voltage in circuit = 12V
Hence, I  = V/R = 12/3 = 4 A
Answered by | 25 May, 2013, 10:22: PM

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