Electric current: Ohm’s law, resistivity

The drift velocity of the electron in physical science is the average speed achieved by charged particles in a material, like electrons, because of an electric field. As a rule, an electron in a guide will engender at the Fermi speed aimlessly, bringing about a speed of zero by and large. An electric field adds […]

Photoelectric effect Photoelectric effect: A history In 1887, Hertz noticed that electrons are emitted from a metal surface when electromagnetic radiation falls. In 1888, Hallwachs showed experimentally that electrons are emitted from the Zinc plate when ultraviolet rays fall on the plate. This phenomenon of emission of electrons from a metallic surface, when illuminated by

The photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light strikes it. These ejected electrons are called photoelectrons. It is important to note that the photoelectron emission and the kinetic energy of the ejected photoelectrons depend on the frequency of the light incident on the metal

As the name suggests, direct current is the flow of current in one direction consistently. It is used in batteries, plugs into the wall with an AC adapter or uses a USB cable. Edison developed it. During the early times, direct current was the dominant form in the US. One cannot convert direct current into

The movement of charged particles or atoms through a conductor or space is called current. The S.I unit is called Ampere. Current is generally of two types – DC and AC. A direct current is a type of current that flows or moves only in one direction. Alternating current changes its direction or flow of

Introduction Alternating current is a type of current whose direction changes periodically through a load, that is, a complete cycle of an alternating current comprises a negative cycle and a positive cycle. When graphically represented, a positive cycle begins from the axis, reaches the maximum positive value upwards and returns to zero (axis). Similarly, a

A unidirectional flow of electric charge is known as a direct current. The most important example of DC is an electrochemical cell. Direct current has the flexibility to flow through conductors, mainly wires. This is how you explain direct current. They can also flow in insulators and semiconductors. They can even flow in vacuum-like ion

Ohm’s Law establishes the relationship between the current (I) and the voltage (V) existing between two points of a conductor. German physicist Georg Ohm presented this law to the world. He was the person to quantify the voltage and current by conducting experiments with circuits having different lengths of wires. Ohm derived a complex form

Introduction Ohm’s law shows the relationship between potential difference and electric current. If current flows through a conductor, the current is proportional to the voltage applied to the conductor. Ohm is the SI unit of electrical resistance. Famous German physicist Georg Simon Ohm worked on resistance in 1826 and published in 1827, in the book

We may utilise Ohm’s Law to get the third quantity if we know two of the quantities (such as voltage, current, or resistance). There are several applications for Ohm’s Law; hence it is critical to know and memorise these formulae correctly to fully understand how Resistance forms the basis of Ohm’s Law. V=IR I=VR R=VI