Question

please solve 20,21 and 22​

Answer 1

Answer:

r1and r2 are connected in series

then

Rs=r1+r3

=3+3

=6ohm

Rs and r3 are connected in parallel

1/rp=1/rs+1/r3

1/rp=1/6+1/3

=1+2/6

=3/6

=1/2

rp=2ohm

Explanation:

rp and r4 are connected in series then

rs'=rp+r4

=2+3

=5ohm

rs' and r5 are connected in parallel

1/rp'=1/rs'+1/r5

=1/5+1/6

=1+1/30

=2/30=1/15

rp'=15ohm

rp' and r6 are connected in series then

rs"=rp'+r6

=15+3

=18 ohm

rs" and r7 are connected in parallel

1/rp"=1/rs"+r7

=1/18+1/6

=1+3/18

=4/18

=2/9

rp"=9/2ohm

rp" and r8 are connected in series

rs*=rp"+r8

=9/2+3

=9+6/2

=15/2 ohm

rs* and r9 are connected in parallel

1/rp*=1/rs*+1/r9

=1/15/2+3

=2/15+3

=2+5/15

=7/15

rp*=15/7 ohm

22. the graph between v and i are in a straight line so the materials or circuit elements which strictly obeys ohms law are ohmic circuit elements.

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