Fundamental Physics/Electricity/Electric Circuit Laws
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Kirchhoff's circuit laws
The sum of all currents entering a node is equal to the sum of all currents leaving the node.
The directed sum of the electrical potential differences around a loop must be zero.
The voltage across a resistor is equal to the product of the resistance and the current flowing through it.
The power across a resistor is equal to the product of the voltage and the current flowing through it.