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Examples: Kirchoff's Voltage Law

<^< Kirchoff's Voltage Law | Course Index | Worksheet: Kirchoff's Voltage Law >^>(:nl:)

>>frame round<< Example 1:

Determine the voltage drop across R1 and the current flowing in it.

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>>id=example1 class=question margin=10px frame round<< The Kirchhoff's Voltage Law equation for this circuit is:

+V'_R1_' + E2 - E3 - E1 = 0

hence:

V'_R1_' = 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 = V'_R1_' / R1 = 4.5 / 90 = 0.05 A = 50 mA >><<

>>frame round<< Example 2:

Determine the value of V'_X_' and the current flowing in R1.

>><<

>>id=example2 class=question margin=10px frame round<< The Kirchhoff's Voltage Law equation for this circuit is:

+45 - V'_X_' - 12 - 18 = 0

hence:

V'_X_' = 45 - 12 - 18 = 45 - 30 = 15 V

We can now use Ohm's Law to determine the current in R1 from:

I = V'_X_' / R1 = 15 / 7.5 = 2 A

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