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# Module 4.0

# DC Transients

- Section 4.1 Resistors in DC circuits.
- • Transient events in DC circuits.
- •The difference between Ideal and Practical circuits
- •Transient current and voltage relationships in a simple resistive circuit.
- Section 4.2 Capacitance and Resistance in a DC Circuit.
- • Transient voltage and current relationships in a simple LR circuit.
- Section 4.3 CR Time Constant.
- • Transient voltage and current relationships in a simple CR circuit
- Section 4.4 Inductance and Resistance in a DC Circuit.
- • The Time constant of a LR circuit.
- • Calculations involving time constants in a simple LR circuit.
- Section 4.5 LR Time Constant
- • The Time constant of a CR circuit.
- • Calculations involving time constants in a simple CR circuit.
- Section 4.6 DC Transients Quiz
- • Module 4 Quiz: Revision questions on DC transient events.

## What happens when things change.

AC Theory could be described as "The study of electronic circuits in which things are always changing". Voltages, currents and other quantities in AC circuits are in a continual process of change.

Before studying AC circuits in depth, Module 4 looks at what happens when conditions suddenly change (called transient events) in DC circuits, so that what is learned here can be used as a foundation for later modules.

Each time a switch is clicked or an input is connected, circuit conditions change, but only for short time, during these brief transient events, components and circuits may behave differently to the way they behave under normal "static" conditions.

This module describes the effects of transient events on resistors, inductors and capacitors.