Electricity & Electronic Workbooks

DC Fundamentals Unit 7 – Series Resistive Circuits

In a series circuit, current is the same through each part of the circuit.

IT = VA/RT

In a series circuit, the applied voltage equals the sum of each voltage drop.

VA = VR1 + VR2 + VR3

In a one-resistor series circuit, all of the applied voltage is dropped across the resistor. The
voltage drop (also commonly referred to as IR drop) has the same polarity as the voltage source:
negative where electrons enter the resistor and positive where electrons leave the resistor.

In this circuit, point A is said to be positive with respect to point B, or point B is negative with
respect to point A.