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what is ohm Related: What is Electric Current (Ohms law, Resistance a...
Ohm’s Law
ohm's law
George Simon ohm(in 1826)studied relationship between I and V across the ends of conductor.
Ohm’s Law states that electric current flowing in a conductor is directly proportional to potential difference across the ends of the conductor,provided temperature and other physical conditions remains constant.
V=IR
R=Resistance of conductor
Resistance of a conductor is the property of conductor to oppose the flow of charge through it.
V
R=—–
I
Unit of resistance is ohm
1 Volt
1ohm=—————-
1 Ampere
Resistance of a conductor is said to be 1 ohm if a potential difference of 1 volts across the ends of conductor makes a current of 1 ampere to flow through it.
I
Slope =—–
V
Slope of graph V and I=Resistance of a conductor
V=IR
V
I=—
R
If R is halved then I is doubled.
If R is doubled then I is halved.
In an electric circuit,sometimes current has to be increase or decrease.A component used in an electric circuit to change the current without changing the potential difference across the circuit is called variable resistance.
Rheostat is a device used in electric circuit to change the resistance and hence current in circuit.
A conductor or material which offers low resistance to the flow of electrons or electric current in an electric circuit is called as good conductor.
A conductor or material which offers higher resistance to the flow of electrons or electric current in an electric circuit is called as bad conductor.
A material which offers very high resistance to the flow of electrons or electric current in an electric circuit is called as insulator.
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what is ohm Related: What is Electric Current (Ohms law, Resistance a...
Ohm Is the unit for resistance
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