Kirchhoff’s Current Law (KCL)

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Step Response of an RC Circuit

Applying KCL
Step Response of a Parallel RLC Circuit

Applying KCL at the top node for \(t > 0\),
Source-Free RC Circuit

Applying KCL at the top node
Source-Free Parallel RLC Circuit

Applying KCL at the top node of parallel RLC circuit,

Applying KCL at the top node,
Second-Order Circuits

Turn off the independent sources and obtain the second-order differential equation by applying KCL and KVL.