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Author Archives: admin

Newton’s first law of motion examples and law of inertia

Newton’s 1st law of motion definition Newton’s first law of motion states that ” A body continues its state of rest or of uniform motion in a straight line provided no net force acts on it.” According to newton’s first law of motion ,a body at rest remains at rest provided no net force acts on it.This part of law ...

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chemical effects of electric current

Chemical effects of current Voltmeter or coulomb meter: The vessel in which electrolytes is carried out.It is also called electrolytic cell. Electrolyte: An ionic compound in aquas solution or molten state is called an electrolyte. Electrolysis: On passing current through an electrolyte,chemical changes occur in electrolyte and substances are liberated at the electrodes.This process is called electrolysis. Faraday’s laws: First ...

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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 ...

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Newton’s laws of motion examples and applications in daily life

What are the three laws of motion? Newton’s first law of motion Newton’s second law of motion Newton’s third law of motion Different types of motion in physics with examples History For centuries the problem of motion and its causes was a central theme of natural philosophy,an early name for what we call physics.It was  not until the time of ...

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Energy stored in a capacitor equation derivation

Energy stored in 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 is ...

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capacitance with two different dielectrics equation

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 ...

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formula for total capacitance in series and parallel combination

Formula of equivalent capacitance in series Series combination when capacitors are connected in series,the total capacitance is less than the smallest capacitance value because the effective plate separation increases.The calculation of total series capacitance is analogous to the calculation of total resistance of parallel resistors. This type of combination has the following characteristics: Each capacitor has the same charge across ...

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thermister temperature sensor with types and applications

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 ...

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Image formation by convex and concave lens ray diagrams

 converging and diverging lenses ray diagrams In mirrors images are formed through reflection but lenses form images through refraction.This is explained with the help of ray diagrams as follows: Image formation by convex lens ray diagrams Image formation in convex lens can be explained with the help of three principal rays shown in figure. The ray parallel to the principal ...

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Difference between scalar and vector quantity in tabular form

 What are the differences between scalars and vectors?   Scalars  vectors Physical quantities having magnitude only but no direction are called scalar quantities. Physical quantities having magnitude and direction are called vector  quantities.   Scalar quantities are completely described by: 1:a number 2:a suitable unit vector quantities are completely described by: 1:a numbers 2:by a suitable unit 3:By certain direction ...

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