What is the cathode?
Cathode is an electrode through which the electrical current leaves the polarized electrical equipment. Its opposite is the anode through which the electrical current enters the electrical equipment. Positively charged ions, called cations, move towards the cathode, while negatively charged ions, called anions, move towards the anode. In devices that provide power supply, such as battery discharging, the cathode is positive, but is negatively charged in energy -intensive equipment, including batteries.
In chemistry, the cathode is an electrode of an electrochemical cell in which electrons are reduced or gained. If the electrochemical cell is electrolytic, which means it is supplied with electricity to break chemical compounds, its cathode is negative. In the opposite type of electrochemical cells, galvanic cells, chemical reactions of electricity release and become positive.
Negative polarity must be applied to Thikatoda ElEcrolytic cell for the purpose of driving the required chemical reactions. On the other hand in the galvanic cell, the positive pole must be attached to complete the perimeter. The electrons emitted by the anode return to the cell through the cathode when the perimeter is completed.
In physics and electronics, the cathode is an electrode responsible for emitting electrons to the device, causing it to run. Free -emitted electrons can be derived in many ways, either by thermal or light energy or by a strong external electromagnetic field. The latter method of electrons emissions is called field electrons emissions and the cathode involved is called cold cathodes.
Although they can work at high temperatures, cold cathodes differ from the "hot" variety because they are not directly heated to control electrons emissions. Hot -baths, also known as fibers, are much more common in modern electronics. Cathodes that deriveThey are powered by photoelectric emissions and are used in photovoltaic or solar energy. Different types of metals have electrodes suitable for different ways of providing electricity.