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Electricity & Megnetism

Lenz’s Law of electromagnetic induction

What is Lenz’s Law of electromagnetic induction? Lenz’s law states that:”The direction of induced current is always so as to oppose the change which causes the current.” A mathematical expression of Faraday’s law of electromagnetic induction was derived as: ε = – N ΔΦ/Δt The minus sign in the expression is very important.It has to do with the direction of the ...

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What is transformer?-types,applications & working principle

“A transformer is an electrical device to change a given alternating emf into a larger or smaller alternating emf.”or “It is a static or stationary piece of apparatus that transfers electric power from one circuit to another having mutual inductance without changing the frequency.”A basic transformer is an electrical device constructed of two coils placed in close proximity to each ...

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5 band resistor colour code table and chart

Carbon resistors are most common in electronic equipment.They consists of a high grade ceramic rod or cone ( called the substrate on which is deposited a thin resistive film of carbon. The numerical value of their resistance is indicated by a colour code which consists of bands of different colors printed on the body of the resistor.The color used in ...

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structure of atom for class 9 and 11

what is Atom? “Atom is the smallest particle of an element that possesses the unique characteristics of that element.”All matter is composed of atoms;all atoms consists of electrons,protons, and neutrons except normal hydrogen,which does not have a neutron.Each element in the periodic table has a unique atomic structure,and all atoms within a given element have the same number of protons.At ...

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Potentiometer: definition,types and applications in circuit

What is potentiometer? “A potentiometer is a very simple instrument which can measure and compare potential differences accurately”.Potential difference is usually measured by an instrument called a voltmeter. The voltmeter is connected across the two points in circuits between which potential  differance is to be measured. It is necessary that the resistance of the voltmeter be large compared to the ...

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Different types of resistors with pictures,function and uses

A resistor is an electrical component with a known specific value of resistance.It is probably the most common component in all kinds of electronic equipment ranging from a small radio to a colour television receiver.As its name suggests ,a resister resists or opposes the flow of current through it.Resistance is necessary for any circuit to do useful work.In fact,without resistance,every ...

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electrical energy:definition,formula,unit,examples and uses

Electrical energy definition “Electrical energy is produced by moving electric charges commonly through a wire.”When charge moves from a higher electric potential to a lower potential,it delivers electric current.Thus,the process ,during which charges continuously move from a higher potential to a lower potential,becomes a continuous source of electrical.E. Examples of electrical energy Turbine runs generator to produce electrical energy when ...

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What is a capacitor?|types of capacitors with applications

“A capacitor is device that can store charge.”Apart from resistors and inductors a it is the other basic component commonly used in electronic circuits.It is a device which  has the ability to store charge which neither a resistor nor an inductor  can do , it opposes any change of voltage in the circuit in witch it is connected , it ...

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Electric flux formula with SI unit and examples

What is Electric Flux? “Total number of field lines passing through a certain element of area is called flux”. It may also be defined as “The scalar product of electric field intensity E and vector area  A“. Electric flux formula It is denoted by Greek letter Φ. Φ=E.A Φ=EAcosθ Where θ is the angle between E and A.It is a scalar quantity. SI ...

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