Unit 1 - Basic Circuit Analysis Flashcards

Comprehensive vocabulary flashcards covering basic circuit concepts, fundamental electrical quantities, circuit element definitions, network terminology, Kirchhoff's laws, source transformations, and nodal analysis.

Electrical Circuit

A closed conducting path through which electric current flows from a power source, through one or more electrical components, and back to the source.

Charge

The amount of electricity, represented by symbol $Q$, measured in Coulombs ($C$) using an electrometer.

Current

The flow of electric charge, represented by symbol $I$, measured in Amperes ($A$) using an ammeter.

Voltage

The electrical force that drives current, represented by symbol $V$, measured in Volts ($V$) using a voltmeter.

Resistance

The opposition to the flow of current, represented by symbol $R$, measured in Ohms (̐\Omega) using an ohmmeter or multimeter.

Power

The rate at which electrical energy is used, represented by symbol $P$, measured in Watts ($W$) using a wattmeter.

Energy

The total electrical work done over time, represented by symbol $E$, measured in Joules ($J$) using an energy meter.

Active Elements

Circuit elements capable of delivering energy to external devices, such as independent and dependent voltage or current sources.

Passive Elements

Circuit elements capable of receiving energy or power, including resistors, capacitors, and inductors.

Resistor

A passive circuit component that opposes electric current.

Capacitor

A passive circuit component that stores electrical charge.

Inductor

A passive circuit component that stores magnetic energy.

Circuit Elements Schematics

Standard graphical representations used in circuit diagrams for active and passive components.

Node

A connection point of two or more circuit elements.

Branch

A single path between two nodes containing one or more elements.

Junction

A node where three or more branches meet.

Loop

Any closed path in an electrical circuit.

Mesh

A loop in a circuit that has no other loops inside it.

Ohm's Law

The law stating that current flowing through a conductor is directly proportional to the applied voltage ($V = I \times R$), provided temperature and physical conditions remain constant.

Kirchhoff's Current Law (KCL)

The principle based on conservation of charge stating that the algebraic sum of all currents entering and leaving a node is zero ($\sum I = 0$).

Kirchhoff's Voltage Law (KVL)

The principle based on conservation of energy stating that the algebraic sum of all voltages around a closed loop is zero ($\sum V = 0$).

Voltage Divider Rule

A rule stating that when resistors are connected in series, the source voltage divides across them in direct proportion to their individual resistance values.

Current Divider Rule

A rule stating that when resistors are connected in parallel, the source current divides among them in inverse proportion to their individual resistance values.

Ideal Voltage Source

An active source that maintains a constant voltage $V_s$ independent of load current, with zero internal resistance ($R_s = 0\,\Omega$).

Practical Voltage Source

A voltage source with a small internal resistance $R_s$ in series, causing terminal voltage to vary with load current ($V_{\text{terminal}} = V_s - I R_s$).

Ideal Current Source

An active source that delivers constant current $I_s$ independent of terminal voltage, having infinite internal resistance ($R_s = \infty$).

Practical Current Source

A current source having a large but finite internal resistance $R_s$ connected in parallel with the source.

Source Transformation

A simplification technique that replaces a practical voltage source ($V_s$ with series $R_s$) with an equivalent current source ($I_s = \frac{V_s}{R_s}$ in parallel with $R_s$), or vice versa.

Nodal Analysis

A systematic circuit analysis technique used to determine voltages at non-reference nodes relative to ground by applying Kirchhoff's Current Law (KCL) at each node.