CURRENT RULES
At any junction in a circuit, the total current leaving the junction is equal to the total current entering the junction.
The current entering a component is the same as the current leaving component.
The current passing through two or more components in series is the same through each component.
POTENTIAL DIFFERENCE RULES
For two or more components in series, the total pd across all the components is equal to the sum of the potental difference across each component.
The pd across components in parallel is the same.
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