In a battery, or voltaic pile, the negative terminal or wire, called the anode, emits electrons in an electrical circuit.
The other terminal, called the cathode, collects electrons in an electrical circuit.
zinc
Zinc
Electrodes
Zinc
No.
There are three terminals on a transistor. Some have four, where the fourth is a screen.The normal three are Emitter, base and collector. The Emitter emits electrons, the collector collects them and the base controls the flow.
The three components of a vacuum tube are the cathode, which emits electrons when heated; the anode, which collects the emitted electrons; and the grid, which controls the flow of electrons between the cathode and anode.
hot filament
An automobiel battery can explode. The battery emits a very small amount of Hydrogen gas which is highly flammable.
In a directly heated cathode, the filament is the cathode and emits the electrons. In an indirectly heated cathode, the filament or heater heats a separate metal cathode electrode which emits the electrons.
Hhn
It is the pigment. It emits electrons after exited.