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Common Circuit Symbols
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Circle with the letter 'A' inside
Ammeter - Measures the current flowing through a circuit
Open-ended arc with an arrow pointing to it
Variable resistor (Potentiometer) - Allows the adjustment of resistance
Two parallel lines, one longer than the other
Battery - Provides a voltage difference between its positive and negative terminals
Circle with a wavy line inside
Speaker - Converts electrical signals into sound
Microphone symbol
Microphone - Converts sound into electrical signals
Arrow with two lines forming a small arrow head
Inductor - Stores energy in a magnetic field when current flows
Circle with a cross inside
Potentiometer - Measures rotation or linear motion position
Triangle with a line at the point and three lines emanating from the line
Operational Amplifier (Op-amp) - Amplifies input signals
Circle with an 'S' inside
Switch - Connects or disconnects components in a circuit
A triangle pointing to a line
Diode - Allows current to flow in one direction only
Straight line intersected by a curved line
Resistor - Provides a specific resistance to electrical flow
Oval shaped symbol with two lines extending from the sides
Fuse - Protects circuit from excessive current
Z-shaped symbol
Zener Diode - Allows current to flow in the reverse direction when voltage exceeds a certain value
Plus sign with four dots around it
Bridge Rectifier - Converts AC to DC
Circle with an 'M' inside
Motor - Converts electrical energy into mechanical energy
Triangle with a line (ground symbol) connected to the bottom vertex
Ground - A reference point for circuit voltages
Circle with a horizontal line through it
Capacitor - Stores and releases electrical energy
T-shape with a horizontal line through the vertical line
Transistor (NPN) - Amplifies or switches electrical signals
Arrow pointing rightwards, intersected by a line
Light Emitting Diode (LED) - Emits light when current flows through
Broken circle with an 'X' in the center
Buzzer - Emits sound when energized
Two intersecting circles
Transformer - Changes the voltage level of an AC signal
C with a line through it
Variable capacitor - Allows the adjustment of capacitance
T-shape with two horizontal lines through the vertical line
Transistor (PNP) - Amplifies or switches electrical signals
Circle with the letter 'V' inside
Voltmeter - Measures the voltage across points in a circuit
Antenna symbol (triangle with line and two smaller lines)
Antenna - Transmits and/or receives electromagnetic waves
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