State the applications and limitations of Ohm's law 5 points please post..
I have 2 submit 2morrow.
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Answered by
18
Ohm's law
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The equation ,V = iR is not ohm's law . It is a mathematical relation between current passing through a resistance,value of resistance R and potential difference V across it.
According to ohm's law ,there are some of the materials (like metals or conductors) or some circuits for which , current passing through them is proportional to the potential difference applied across them or V-i graph of such materials and circuits is a straight line passing through the origin . Slope of this graph is called it's resistance. The materials or circuits which follow this law are called ohmic.
The materials or circuits which don't follow this law are called non-ohmic . V-i graph for non-ohmic circuits is not straight line passing through origin . V/i or is not constant and i is not proportional to V .
Note :-
★ Equation V=iR is applicable from every ohmic and non-ohmic circuits...
★Equality V/i = R is called ohm's law equation but it's not applicable on non-ohmic substances.
For example :-
From the graph in the attachment.....
V1/i1 = R1 = resistance of P
V2/i2 = R2 = resistance of Q
But R1 ≠ R2
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♦Some limitations of ohm's law :-
•There is a range of voltages over which the resistance is fairly constant. Due to dissipation of heat, the resistance is heated and its resistance changes.
•Some materials do not obey ohm's law below a certain temperature. the material behaves differently.
•Non-ohmic resistors like diodes, semi-conductors or insulators, do not obey ohm’s law.
---------------
The equation ,V = iR is not ohm's law . It is a mathematical relation between current passing through a resistance,value of resistance R and potential difference V across it.
According to ohm's law ,there are some of the materials (like metals or conductors) or some circuits for which , current passing through them is proportional to the potential difference applied across them or V-i graph of such materials and circuits is a straight line passing through the origin . Slope of this graph is called it's resistance. The materials or circuits which follow this law are called ohmic.
The materials or circuits which don't follow this law are called non-ohmic . V-i graph for non-ohmic circuits is not straight line passing through origin . V/i or is not constant and i is not proportional to V .
Note :-
★ Equation V=iR is applicable from every ohmic and non-ohmic circuits...
★Equality V/i = R is called ohm's law equation but it's not applicable on non-ohmic substances.
For example :-
From the graph in the attachment.....
V1/i1 = R1 = resistance of P
V2/i2 = R2 = resistance of Q
But R1 ≠ R2
-------------------------------------------------
♦Some limitations of ohm's law :-
•There is a range of voltages over which the resistance is fairly constant. Due to dissipation of heat, the resistance is heated and its resistance changes.
•Some materials do not obey ohm's law below a certain temperature. the material behaves differently.
•Non-ohmic resistors like diodes, semi-conductors or insulators, do not obey ohm’s law.
Answered by
3
heya,
It's Aastha ..
◆◆Ohm's Law
When an electric potential difference (V) is applied across a conductor as shown in the figure below, some current (I) flows through it. The flow of current is opposed by the resistance of the conductor and circuit. The relation between voltage, current and resistance is explained by the ohm’s law.
Ohm’s laws state that the current through any two points of the conductor is directly proportional to the potential difference applied across the conductor, provided physical conditions i.e. temperature, etc. do not change. It is measured in (Ω) ohm.
In a circuit, when current flows through a resistor, the potential difference across the resistor is known as voltage drops across it, i.e., V = IR.
✡️✡️Limitations of Ohm’s Law
Ohm’s law is not applicable in unilateral networks. Unilateral networks allow the current to flow in one direction. Such types of network consist elements like a diode, transistor, etc.
I hope it help you
It's Aastha ..
◆◆Ohm's Law
When an electric potential difference (V) is applied across a conductor as shown in the figure below, some current (I) flows through it. The flow of current is opposed by the resistance of the conductor and circuit. The relation between voltage, current and resistance is explained by the ohm’s law.
Ohm’s laws state that the current through any two points of the conductor is directly proportional to the potential difference applied across the conductor, provided physical conditions i.e. temperature, etc. do not change. It is measured in (Ω) ohm.
In a circuit, when current flows through a resistor, the potential difference across the resistor is known as voltage drops across it, i.e., V = IR.
✡️✡️Limitations of Ohm’s Law
Ohm’s law is not applicable in unilateral networks. Unilateral networks allow the current to flow in one direction. Such types of network consist elements like a diode, transistor, etc.
I hope it help you
Aasthakatheriya1:
ur welcome
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