Basic Linear Circuits Review

Common Measurements and Units

In the representations of measurements such as charge, voltage, current, and power, an uppercase letter (C, V, I, P) implies that it is constant, and a lowercase letter (c,v,i,p) implies that it is time-variant.

Coulomb (Charge)

The coulomb is the SI unit for charge.

Volt (Electric Poential)

The volt is a unit for the potential energy between two points. 1 volt is equal to 1 Joule per Coulomb (V=J/C). Current tends to flow from high voltage to low voltage.

Amp (Current)

The Amp is a unit for the current flowing through a conductor

Common Electrical Components

Symbols, Variables, and Units

	symbol	variable	units
current source	File:Current source symbol.jpg	I	Ampere (A)
voltage source	File:Voltage source round symbol.jpg or File:Voltage source batt symbol.jpg	V	Volt (V)
resistor	File:Resistor symbol.jpg	R	Ohm ($\Omega$)
capacitor	File:Capacitor symbol.jpg or File:Capacitor polarized symbol.jpg (polarized)	C	Farad (F)
Inductor	File:Inductor symbol.jpg	L	Henry (H)