Home » Electricity & Megnetism (page 5)

# Electricity & Megnetism

## Different types of resistors and their uses with symbols and functions

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 ...

## electrical energy examples and uses in everyday life

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 energy. Examples of electrical energy Turbine runs generator to produce electrical energy ...

## Ohm’s law formula:Relationship between voltage current and resistance

Ohm’s law definition 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.” Ohm describes mathematically how voltage,current and resistance in a circuit are related.It is used in the equivalent form depending on which quantity you need ...

## Difference between resistance and resistivity

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 ...

## What is the difference between 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 ...

## Capacitance of capacitors in electricity and electronics

What is capacitance in a circuit? “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. Formula of capacitance of a capacitor ...

## Different types of capacitors and their uses with images and applications

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 ...

## Difference between electric potential and potential difference

Electric potential definition ”  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.” Electric potential formula 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 ...