Schematic Symbols

no connection

connection

battery

cell

variable DC source

AC source

photovoltaic cell

ground

chassis connection

fuse

resistor

variable resistor

photoresistor

inductor

capacitor

speaker

lamp

neon lamp

transformer

diode

LED

NPN transistor

PNP transistor

SPST switch

SPDT switch

DPST switch

DPDT switch

pushbutton switch N.O.

pushbutton switch N.C.

relay

AND gate

OR gate

inverter (NOT gate)