(a) Using Kirchhoff\'s rules and given ? 1 = 76.0V, ? 2 = 60.0V, ? 3 = 80.0V), f

Question

(a) Using Kirchhoff's rules and given ?1 = 76.0V, ?2 = 60.0V, ?3 = 80.0V), find the current in each resistor
_______mA (R1)
_______mA (R2)
_______mA (R3)
(b) Find the potential difference between points c andf.
Which point is at the higher potential?

(a) Using Kirchhoff's rules and given ?1 = 76.0V, ?2 = 60.0V, ?3 = 80.0V), find the current in each resistor _______mA (R1) _______mA (R2) _______mA (R3) (b) Find the potential difference between points c andf. Which point is at the higher potential?

Explanation / Answer

for loop bcfab

e1 - e2 - i2*R2 - i1*R1 = 0

76-60 - i2*3000 - i1*2000 = 0.............(1)

for loop

cdefc

e2 - (i1-i2)*R3 - e3 + i2*R2 = 0

60-80-i1*4000 + i2*4000 + i2*3000 = 0

-20-i1*4000+i2*7000 = 0...............(2)

from 1 & 2

i1 = 0.002 A

i2 = 0.004 A

i3 = i1 - i2 = -0.002 A

through R1 = 2 mA

through R2 = 4 mA

through R3 = 2 mA

b) Vcf = e2 - R2*i2 = 60-(3000*0.004) = 48 V

c is at high potential

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