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18.
I4 = I - I1 - I2 - I3 = 9A - 3A - 3A - 2A = 1A (d)
19.
1/Rp = 1/R2 + 1/R3
1/Rp = 1/4 +1/4
1/Rp = 1+1 / 4
1/Rp = 2/4
Rp = 4/2
Rp = 2 Ohm
Rs = R1 + Rp + R4
Rs = 1,5 + 2 + 1,5
Rs = 5 Ohm (b)
20.
1/Rp = 1/R1 + 1/R2
1/Rp = 1/10 + 1/10
1/Rp = 1+1 / 10
1/Rp = 2/10
Rp = 10/2
Rp = 5 Ohm
Vpq = I x R
Vpq = 2A x 5 Ohm
Vpq = 10 Volt (b)