19. Show how you would connect three resister each of resistance 6ohm, so that combination has
a resistance of (i) 9ohm and
(ii) 4ohm
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Explanation:
if you want the resistance as 4ohm
the connect two resistor in series and one resistor as parallel to that
fig 6 ohm 6ohm
l-•-------------^^^^^^-------^^^^^^-------------
l
l
l
|
l
l 6ohm
l----------------^^^^^^^^^^^^-----------------------
from above diagram
resistivity of series is
R1 +R2=6ohm+6ohm= 12ohm
and if we want 9 ohm then
we know that 1/R1+1/R2=1/R(FOR RESISTIVITY in parallel)
1/6+1/12
=1/4 = 1/R
R=4
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