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Solar cell / solar battery
Converts light into electricity. Battery symbol with arrows pointing in.


Amplifier
Increases the strength of a signal. Triangle pointing the way the signal flows.


Antenna (aerial)
Sends or receives radio waves.


Wattmeter
Measures electrical power in watts.


Oscilloscope
Displays a signal's waveform on a screen.


Neon lamp
Glows when the gas inside ionizes.


Electric bell
Makes an audible ringing sound.


Earphone
Converts a signal into sound at the ear.


Heating element
Converts electrical energy into heat.


Double junction
Two separate connection points on one conductor.


Plug (male)
The male half of a connector.


Socket (female)
The female half of a connector.


Positive polarity
Marks the positive terminal or side.


Negative polarity
Marks the negative terminal or side.


Variability marker
A diagonal arrow meaning the component it crosses is adjustable.
