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Example 1:
Determine the voltage drop across R1 and the current flowing in it.
The Kirchhoff's Voltage Law equation for this circuit is:
+VR1 + E2 - E3 - E1 = 0
hence:
VR1 = E3 + E1 - E2 = 1.5 + 6 - 3 = 4.5 V
We can now use Ohm's Law to determine the current in R1 from:
I = VR1 / R1 = 4.5 / 90 = 0.05 A = 50 mA
Example 2:
Determine the value of VX and the current flowing in R1.
The Kirchhoff's Voltage Law equation for this circuit is:
+45 - VX - 12 - 18 = 0
hence:
VX = 45 - 12 - 18 = 45 - 30 = 15 V
We can now use Ohm's Law to determine the current in R1 from:
I = VX / R1 = 15 / 7.5 = 2 A
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