Home » Author Archives: admin (page 4)

Author Archives: admin

Different types of rectifiers and their applications in daily life

What is Rectification? Conversion of alternating current into direct current is called rectification. Semiconductor diodes are extensively used for this purpose. How many types of rectification ? There are three common types of rectification: Half wave rectification Full wave rectification Full Wave Bridge Rectification Voltage multipliers rectification Half Wave Rectification An alternating voltage of Time period T is called input ...

Read More »

Four fundamental forces of nature strongest to weakest

Basic forces of nature physics The man has always desired to comprehend the complexity of nature in terms of as few elementary concepts as possible. Among its quest, in Feynman’s words,has been the one for “wheel within wheels”, the task of Natural Philosophy being to discover the innermost wheels if any such exits. A second quest has concentrated itself with ...

Read More »

Difference between gravitational force and electrostatic force

Gravitational force is the force by which earth attracts other objects by mass. It is a conservative force. While electrostatic force is the force of an object due to charge. It is also conservative force. These two forces belong to the four fundamental forces of nature. Now! We see the difference between gravitational force and electric force in tabular form. ...

Read More »

Find angle between two vectors

The angle between two vectors is referred as a single point, known as the shortest angle by which we have to move around one of the two given vectors towards the position of codirectional with another vector.It is found by using the definition of the dot product of two vectors. How to find Angle between two vectors? We can find the ...

Read More »

Gravitational field strength:formula & definition

What is the Gravitational field? “The space around the earth in which earth can exert a force of attraction on other bodies is called gravitational field.”A basic fact of the gravitation is that to particles exerts forces on one another.This is a direct interaction between the two particles and is called the action at a distance because the two particles ...

Read More »

entropy in thermodynamics with examples and properties

What is Entropy in thermodynamics? The concept of entropy was introduced into the study of thermodynamics by Rudolph Clausius in 1856 to give a quantitative basis for the second law. It provides another variable to describe the state of a system to go along with pressure, volume, temperature and internal energy. If a system undergoes a reversible process during which ...

Read More »

Energy stored in a capacitor equation derivation and problems

Energy stored in a capacitor equation Consider a capacitor with the capacitance ‘C’ ,which is connected to the battery of emf ‘V’ .If ‘dq’ charge is transferred from one plate to other,then the work done ‘dW’ will be: dW =V dq This work done is stored in the form of electric potential energy ‘dU’ dU =V dq When the capacitor ...

Read More »

Difference between polar and non polar dielectric materials

Capacitance with dielectric formula Consider a parallel plate capacitor which is connected with a battery of emf ‘V’ .Let ‘A’ is the area of each plate and ‘d’  is separation between the plates. If ‘q’ charge is stored in the capacitor when there is vacuum or air as medium between the plates ,then: q= CV Where ‘C’ is the capacitance ...

Read More »

Atmospheric pressure:Definition,formula & applications

Atmospheric Pressure The Earth is surrounded by a cover of air called atmosphere. It extends to a few hundred kilometers above sea level. Just as certain sea creatures live at the bottom of ocean, we live at the bottom of a huge ocean of air. Air is a mixture of gases. The density of air in the atmosphere is not ...

Read More »

Difference between thermistor and thermocouples

Thermistor definition A thermistor is a type of  variable resistor that is temperature sensitive . How thermistor works? When its temperature coefficient is negative,the resistance changes inversely with temperature. When its temperature coefficient is positive the resistance changes directly with temperature. The resistance of a photo-conductive cell changes with a change in light intensity.This cell also has a negative temperature coefficient. Symbols for ...

Read More »