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What is a common cathode?

A common cathode is a shared terminal in a multiple LED or display device where all the cathodes of the individual LEDs are electrically connected. This configuration allows for the LEDs to be controlled independently through their anodes.


Why common cathode connection is used in seven segment display using microcontroller 8051?

The output of 8051 micro controller is active high so we must need to use the common cathode type display . it will work glow when any input is high . The anode terminals of leds's of seven segment connected to 8051's output and cathode is common and grounded . so it require common cathode because 8051 provide active high output.


Which of these appliances uses cathode ray tube - electric fan refrigerator or rice cooker?

None of these appliances use a cathode ray tube. Older type TVs used a cathode ray tube, its common name was the picture tube.


What is meaning of perforated cathode?

The. Cathode plate consists of small holes known as perforated cathode plate


Where does reduction occur in an electrochemical cell?

The cathode.


Is the cathode positive in a battery?

No, the cathode is negative in a battery.


Is the cathode red or black?

The cathode is typically black.


Difference between direct and indirect cathode ray?

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.


Why did Thomson see cathode rays with every elements tested?

Thomson observed cathode rays regardless of the element tested because cathode rays are composed of electrons, which are fundamental particles present in all atoms. When a voltage is applied in a vacuum tube, electrons are emitted from the cathode and travel toward the anode, creating the rays. This universality in the presence of electrons explains why he consistently saw cathode rays across different elements. Thus, the experiment demonstrated that electrons are a common component of all matter.


In the cathode ray tube where do the particles originate?

In a cathode ray tube (CRT), the particles, which are electrons, originate at the heated cathode, becoming the so-called cathode rays. The electrons stream off the cathode and rush over to the anode.


What is the charge of the particle in cathode rays?

The charge of the particle in cathode rays is negative. This was determined by J.J. Thomson through his experiments with cathode ray tubes in the late 19th century, which led to the discovery of the electron.


Why cathode rays are negatively charged?

Cathode rays are negatively charged because they are composed of electrons, which have a negative charge. When a high voltage is applied to the cathode in a vacuum tube, electrons are emitted from the cathode and accelerated towards the anode, creating a beam of negatively charged particles known as cathode rays.