Question

a resistance of 5ohm is connected in series with a parallel combination of Rohm and 10ohm. the total power consumed by the circuit is 1200W. the applied voltage is 100V. find R​

Answer 1

Answer:

5 ohms

Explanation:

w=v*current

so

1200=100*12 amp

now

v=i*r

so

100=12*r

so

r=8.33 ohms

= total resis of circuit

=5+ (effective resis of parallel pair) say 5+x

so x= 3.33 ohms or 10/3

This x is effect of 10 and unknown R in parallel

and 1/x=3/10=1/10+1/R

so 3/10 -1/10 =1/R

or 2/10 = 1/R

and R=5 ohms....ANSWER