Cathode
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A cathode is the electrode from which a conventional current leaves a polarized electrical device such as a lead–acid battery. This definition can be recalled by using the mnemonic CCD for cathode cur
Glow from the directly heated cathode of a 1 kW power tetrode tube in a radio transmitter. The cathode filament is not directly visible.
Two indirectly-heated cathodes (orange heater strip) in ECC83 dual triode tube
Cold cathode (lefthand electrode) in neon lamp
Anode
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An anode usually is an electrode of a polarized electrical device through which conventional current enters the device. This contrasts with a cathode, which is usually an electrode of the device throu
Cathode
…battery marked with a + (plus) is the cathode. The electrode through which conventional current flows the other way, into the device, is termed an anode. Conventional current flows from cathode to anode outside the cell or device (with electrons moving in the opposite direction), regardless of the cell…
Sacrificial anodes mounted on the fly for corrosion protection of a metal structure