Other Circuit Symbols in AP Physics C

Note: Resistors can be shown as either a rectangle or a zigzag line. Inductors are included here, but we will cover them in detail later.

Connecting Lead: A straight line representing a wire that connects components in a circuit.
Cell: A single source of electrical energy (one long and one short line).
Battery of Cells: Two or more cells connected together (multiple long and short lines in a row).
Resistor: Limits the flow of current. Shown as a rectangle or a zigzag line.
DC Power Supply: Provides a constant direct current (DC) voltage to a circuit.
Filament Lamp: Produces light when current flows through it. Used as an indicator or load.
Voltmeter: Measures voltage (potential difference) across two points in a circuit. Symbol is a circle with a "V" inside.
Ammeter: Measures current flowing through a circuit. Symbol is a circle with an "A" inside.
Switch: Opens or closes a circuit to stop or allow current flow.
Variable Resistor: A resistor whose resistance can be adjusted. Symbol is a resistor with an arrow across it.
Fuse: A safety device that melts and breaks the circuit if the current is too high.
Earth (Ground): A reference point for voltage; common return path for current.
Alternating Signal: Represents an AC (alternating current) source or signal in a circuit.
Capacitor: Stores electrical energy temporarily. Shown as two parallel lines (sometimes one curved).
Inductor: A coil of wire that stores energy in a magnetic field. We will go over inductors later.

For basic circuit elements (resistor, capacitor, inductor, battery, etc.), see the main circuit symbols reference.