Clive W. Humphris

**IMPEDANCE: RC Series Impedance. **

Impedance is the sum of resistance and reactance in an AC circuit, it is measured in Ohms and given the symbol Z. Impedance can be used in place of resistance when calculating AC using Ohm's Law on reactive circuits. The voltages developed across R and C (Xc) cannot be added directly as the voltage across C is at 90° to that across R.

The impedance triangle can be a useful method to graphically find the impedance Z.

The resultant impedance phase angle will be determined by the relative values of R and Xc. With the angle becoming greater as the reactance of the capacitor to the applied frequency increases.

A lagging (-) phase angle indicates a capacitive circuit.

- Table of Contents
- Interactive eTextbooks
- Basic Electronics
- Conductor And Insulator
- Resistor Value Test
- Simple Dc Circuits
- Types Of Switching
- Variable Voltages
- Ohm's Law
- DC Voltage
- DC Current
- Series and Parallel Resistors
- AC Measurement
- AC Voltage and Current
- AC Theory
- RCL Series
- RCL Parallel
- Capacitance
- Capacitors
- Inductance
- Inductors
- Impedance
- Radio and Communication
- Tuned Circuits
- Attenuators
- Passive Filters
- Active Filters
- Oscillators
- Circuit Theorems
- Complex Numbers
- DC Power
- AC Power
- Silicon Controlled Rectifier
- Power Supply
- Voltage Regulation
- Electro-Magnetism
- Electrical Machines
- Transformers
- Three Phase Systems
- Energy Transfer and Cost
- Atomic Structures
- Diode Theory
- Diode Applications
- Transistor Theory
- Bipolar Transistors
- Transistor Configurations
- Active Transistor Circuits
- Field Effect Transistors
- Basic Operational Amplifier
- Op-Amp Theory
- Op-Amp Applications
- Sum and Difference Amplifiers
- Analogue Multi-Meter
- Component Testing