I am confused about when to use KVL/KCL or ohm's law to solve the circuit question?
I need to compute voltage in point B and point C, every current pass through R1 R2 R3 R4
R1= 100 ohm, R2=300 ohm, R3=250 ohm, R4=500 ohm
V1= 5V, Is=20mA
I tried to use ohm's law to find all current first, but I don't know how to use Is to help me. Or find out the total resistance then finding total current?
And how to use Is when applying KCL, is it a current source?
Or I can separate circuit into two independent circuits to solve the question.
I hope someone can help me to clear my electricity concept.
the resistance of r1 and r2 =1/(1/100+1/250)= 500/7 ohm ≈ 71.4 ohm
total resistance of a circuit = 500/7 + 300 + 500 = 6100/7 ohm ≈ 871 ohm
current supply from 5V : I = V/R = 5/(6100/7) = 7/1220 A ≈ 5.74mA
5.73= (VB-VGround)/250 + (VB-VC)/300 = VB/250 + (VB-VC)/300
5.73=VB/250 + (VB-VC)/300 -(1)
I4+Is = (VC-VGround)/500
I4+ 20mA = VC/500 -(2)
apply KVL: VB-(VB-VC)+VC = 0 -(3)
Is it correct, should I continue?