The electron current is chiefly due to:
Correct answer: A. Cathode
- A. Cathode
- B. Grid
- C. Anode Getter
- D. Screen
Explanation
In an electronic device, such as a vacuum tube or an electron tube, the flow of electrons, also known as electron current, is primarily determined by the cathode. The cathode is a negatively charged electrode that emits electrons through a process called thermionic emission or by other means such as field emission. When a voltage is applied between the cathode and the anode, the cathode releases electrons into the surrounding space, creating a cloud of negatively charged particles. These electrons are then accelerated toward the anode, which is a positively charged electrode. The movement of electrons from the cathode to the anode constitutes the electron current.
Last updated
About Steady Current
Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2.00 x 10^6 e passing through a conductor in 1 millisecond. Electric current through conductor is:
A 0.01A moving coil Galvanometer of 5 Ω resistance can be converted into a 0.2A ammeter by a resistance R with the Galvanometer when r is:
A 1000 W lamp operates at 220 V for 60 s.The electric current passing through the lamp will be
A 3 V battery is connected in series with ammeter and 2 ohm resistance after short circuiting. What will be the reading of ammeter?
a battery of 12 volts is connected to three resistors of 4 ohm, 5 ohm and 3 ohm joined together in parallel, the current through 3 ohm resistor would be?