KCL Solved Examples and solution | Electric current 12th Physics Concepts
Before solving the KCL Solved examples, we must know what is KCL Law? There are two existing fundamental law which are used to calculate the current circuit property. The two laws are KCL and KVL. KCL stands for Kirchoff’ Current Law while the KVL stands for Kirchoff’ Voltage Law. We have discussed about the Electric Current and its explanation and effect in our previous post on What is Electric Current?
Now here are some solved problems on KCL and examples on properties of current source and we will also discuss about current division method for calculating current in the circuit.
KCL Solved Examples and solution
Ques:1 Using KCL law find the unknown current in the Figure shown below:
Solution: Given that
Apply KCL At Node 3
Ques:2 Find the current ‘‘ through the resister ohm.
Solution: Let us consider the voltage ‘V1’at node A.
Apply KCL at node A ————(1)
Calculate the voltage value at Node
Ques:3 Find the current I through Resistor R When 5 Ampere current source is in:
- same direction to the 10 Ampere current source
- opposite direction to the 10 Ampere current source.
In case a: using KCL
In case b: using KCL
Current Division Rule:
Now we are going to discuss current division method for calculating branch current in parallel circuit (divider circuit). In series circuit it is not applicable (voltage division method is applicable). When current flows through more than one impedance path i.e in divider circuit,then each branch shares some portion of total current depending on the impedance on that branch, the formula is given below:
Current to be calculating= Impedance through which current is not calculate
You can make it clear by solving a question on this method.
Ques:4 Find the current through the resistor in the following circuit.
Solution: First calculate the total impedance of the circuit then calculate the current delivered by the voltage source
; ; ;
Now we will calculate Current delivered by the Voltage source using Ohm’s law:
For calculate the current through Resistor,we have to first calculate the branch current.Let Current through R2 be I1 and through R5 be I2 branches can be calculate by using Current division Rule :
Now calculate the current through resistor
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