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What are Cathode and Anode?

What are Cathode and Anode?

Let us understand what cathode and anode exactly mean. They are both defined by the flow of current. Therefore, a cathode is an electrode from which the current exits a polarized electrical device.
Likewise, an anode is an electrode from which a current enters into a polarized electrical device.

The terms were finalized in 1834 by William Whewell who adapted the words from the Greek word (kathodos), ‘descent’ or ‘way down’. William had consulted with Michael Faraday for the coining of the terms.


When we talk about cathode in chemistry, it is said to be the electrode where reduction occurs. This is common in an electrochemical cell. Here, the cathode is negative as the electrical energy that is supplied to the cell results in the decomposition of chemical compounds. However, it can also be positive as in the case of a galvanic cell where a chemical reaction leads to the generation of electrical energy.

In addition, a cathode is said to be either a hot cathode or a cold cathode. A cathode which is heated in the presence of a filament to emit electrons by thermionic emission is known as a hot cathode whereas cold cathodes are not heated by any filament. A cathode is usually flagged as “cold” if it emits more electrons compared to the ones generated by thermionic emission alone.


In the most basic form, an anode in electrochemistry is the point where an oxidation reaction occurs. Generally, at an anode, negative ions or anions due to its electrical potential tend to react and give off electrons. These electrons then move up and into the driving circuit.

If we take a galvanic cell, the anode is negative in nature and the electrons mostly move towards the external part of the circuit. In an electrolytic cell, it is again positive. Additionally, an anode can be a plate or wire having an excess positive charge.

Difference Between Anode And Cathode

Here are some key differences between cathode and anode.



The   anode is the electrode where electricity moves into.

The   cathode is the electrode where electricity is given out or flows out.

The   anode is usually the positive side.

A   cathode is a negative side.

It   acts as an electron donor.

It   acts as an electron acceptor.

In   an electrolytic cell, oxidation reaction takes place at the anode.

In   an electrolytic cell, a reduction reaction takes place at the   cathode.

In   galvanic cells, an anode can become a cathode.

In   galvanic cells, a cathode can become an anode.

Why do YOU need to Second Source a component?

This was a question many people asked years ago before this market change. “Why do I need to second source if my supply chain is fine?”
Now, we are getting the question “Can you find me a second source?”

Shortage bothers everyone in electronic components field over year and it’s continue. Especially the shortages for IC, MCU, MOSFET etc. 
Lead time is being pushed out to 90+ weeks for some parts and prices are being raised sometimes more than several times.
Given above, it’s necessary for you to consider a few new Chinese supplier like Topdiode in order to secure and improve your supply chain.

How can Topdiode help?  

Topdiode Group (Topdiode & UF Capacitor) is a leading manufacturer of wide range components, covering capacitors, diode & transistors and MOSFET in China Since 1995.
As a Chinese factory, we are not only good at fast lead time but also quality control. Our market position is to replace first tier brands like Murata, TDK, AVX, Vishay, Littelfuse, Onsemi, Diodes etc with similar quality but much better price.  We keep stock for chip MLCC and some fast running tantalum capacitors, for balance, lead time is around 4 weeks.

Come to contact us for solutions to shortage and cost down, grow business together.