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Electricity & Megnetism

Capacitance of a capacitor

Capacitance of a capacitor is the ability of capacitor  to store an electric  charge per unit of voltage across its plates of a capacitor .Capacitance is find by dividing electric charge with voltage by the formula C=Q/V .Its unit is Farad. Formula Its formula is given as: C=Q/V Where C is capacitance,Q is voltage,and V is voltage.We can also find charge Q ...

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Galvanometer and ammeter

Galvanometer and ammeter are both current measuring devices.The galvanometer is used to measure very small current while ammeter is used to measure very large current up to 10 A. Now! We study in detail about these two instruments and we will also see the difference between galvanometer and ammeter. What is galvanometer? It is an electrical device which is used to ...

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Difference between gravitational force and electrostatic force in tabular form

The basic difference between gravitational and electrostatic force is that: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 ...

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Difference between thermistor and thermocouple

Thermistor and thermocouple both can be used to measure temperature.Basic difference between thermistor and thermocouple is that “A thermistor can only be used at fairly moderate temperatures.A thermocouple is used to measure typically high temperatures.” 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 ...

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Formula for ohm’s law with example and problems

Ohm’s law states that: “The current flowing through a conductor is directly proportional to the potential difference across its ends provided the physical state such as temperature etc. of the conductor remains constant.”Formula for ohm’s law is “V=IR”. Ohm describes mathematically how voltage,current and resistance in a circuit are related.It is used in the equivalent form depending on which quantity ...

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Relationship between voltage and current

Relationship between voltage and current is describe in equation of ohm’s law (V=IR).Voltage is the amount of energy per charge which is required to move electrons from one point to another,while current is the rate of flow of charges.Difference between voltage and current are given in the table below. What is voltage in electricity? “Voltage is the amount of energy ...

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Resistance definition in physics and electricity

What do you mean by resistance? “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 the type ...

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Types of electric charges with formula and examples

Electric charge is defined as:”An electrical property of matter that exists because of an access or a deficiency of electrons.”There are two types of electric charge,positive charges and negative charges. Its formula is given as: Q =I × t Where Q is the total charge ,I is the amount of current and t is the time. Electric charge examples If you ...

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Coulomb’s law examples and problems

“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”.Coulomb’s law examples are given below. Charles Agustin Coulomb (1736-1806) measured electrical attractions and repulsion  quantitatively and deduced the law that governs them.His apparatus,shown in fig. This figure resembles the figure given ...

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Gauss’s law and its applications

 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.”Gauss’s law applications are given below. It is given by Karl Friedrich  Gauss ,named after him gave a relationship between electric flux through a closed surface and the net charge enclosed by the surface.It is applied to calculate ...

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