Networks Analysis And Synthesis
To determine the polarity of the voltage drop across a resistor, it is necessary to know

Value of current through the resistor
Direction of current through the resistor
Value of resistor
E.m.f. in the circuit

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Networks Analysis And Synthesis
Kirchhoff s current law states that

No current can leave the junction without some current entering it
Total sum of currents meeting at the junction is zero
Hebraic sum of the currents meeting at the junction is zero
Net current flow at the junction is positive

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