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Unit 13: Capacitors in DC Circuits

Recall that resistance is opposition to the flow of current. Capacitance, which we’ll study in this unit, is an entirely different electrical property. It’s the ability to store a charge. Capacitors are components that are manufactured to have this ability.

When a DC circuit has both resistance and capacitance, the currents and voltages will usually change with time. In this unit we’ll study how to predict the values of these changing DC currents and voltages at different times. We’ll also see how to figure out how long it will take a capacitor in a DC circuit to charge up.

Unit 12 Review

Capacitance & Capacitors
Capacitor Application: A Camera Flash
Schematic Symbol, and Appearance
Parallel-Plate Capacitor
Charging a Capacitor

Unit of Capacitance
Charge per Voltage
Energy Stored by a Capacitor

Capacitor Ratings
Nominal Value & Tolerance
Capacitor Identification Game
Temperature Coefficient
DC Working Voltage
Leakage Resistance

Capacitor Types
Electrolytic Capacitors
Variable Capacitors

Stray Capacitance

Capacitors in Series
Shortcut Rules for Capacitors in Series
Charge on Capacitors in Series
Voltage on Capacitors in Series

Capacitors in Parallel
Charge and Voltage on Capacitors in Parallel

Series-Parallel Capacitors

Don’t Connect Capacitors Directly Across a Voltage Source
Series RC Network
DC RC Circuit
Behavior of Capacitors in DC Circuits

Initial, Transient, Steady-State
Initial Currents and Voltages
Steady-State Currents & Voltages
v and i
Transients While Charging
Calculating i
Exponential Decay
Time Constant
How Long to Charge?
Calculating vR and vC
More Exponential Curves
Discharging a Capacitor

General Exponential Equations

Series-Parallel Transients

Unit 13 Review

Congratulations! You’ve completed the e-Lesson for this unit.