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Electricity & Megnetism

Electrical resistance measurement

What is the definition of resistance in physics? “Resistance is the property of material that restricts the flow of electrons.”When there is current in a conductive material ,the free electrons move through the material and occasionally collide with atoms.These collisions cause the electrons to lose some of their energy,and thus their movement is restricted.This restriction varies and is determined  by ...

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What is voltage and current?

What is voltage in electricity? “Voltage is the amount of energy per charge available to move electrons from one point to another in an electric circuit.”It is the driving force in electric circuits and is what establishes current.As you have seen,a force of attraction exists between a positive and a negative charge. A certain amount of energy must be exerted,in ...

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Capacitance formula in series and parallel circuits

What is capacitance? “Capacitance is the amount of charge that a capacitor can store per unit of voltage across its plates.”It is denoted by C.That is capacitance is a measure of a capacitor’s ability to store charge.The more charge per unit of voltage that a capacitor can store,the greater its capacitance,its formula is given as: C=Q/V Where C is capacitance,Q ...

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Capacitor and capacitance

What is capacitor? “A capacitor is device that can store charge.”Apart from resistors and inductors a capacitor 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 ...

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Electric potential formula

”  Electric potential at a point in an electric field is equal to the amount of  work  done in bringing a unit positive charge from infinity to that point.”If  W  is the work done in moving a unit positive charge from infinity to a certain point in the field ,the electric potential V at this point would be given by: ...

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GAUSS’S LAW for electricity and magnetism derivation examples and applications

What is Gauss’s law?                                        Gauss’s law states that: “The total electric flux through any closed surface  is equal to 1/ε0 times the total charge enclosed by the surface.” It is given by Karl Friedrich  Gauss ,named after him gave a relationship between ...

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Electric and magnetic flux density

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“.It is denoted by Greek letter Φ. Φ=E.A Φ=EAcosθ Where θ is the angle between E and A.Electric flux is a scalar quantity.Its SI unit Nm²/c.Below figure ...

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What is an Electric Charge?

What is an Electric Charge? Electric charge is defined as:”An electrical property of matter that exists because of an access or a deficiency of electrons.” If you walk across a carpet in dry weather,you can draw a spark by touching a metal door knob.On a grander scale,lightning is familiar to everyone.Such phenomena suggest the vast amount of electric charge that ...

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Coulomb’s Law definition examples and solutions

What is Coulomb’s law? “Coulomb’s law states that  force of attraction or repulsion between two electric charges is directly proportional to their magnitudes and inversely proportional  to the square of distance between them”.It is mathematically explained as: Charles Agustin Coulomb (1736-1806) measured electrical attractions and repulsions  quantitatively and deduced the law that governs them.His apparatus,shown in fig. This figure resembles ...

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