Ω Ohm`s law

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Presentation Transcript

Ω Ohm`s Law : 

Ω Ohm`s Law

George Simon Ohm(17 March 1789-6 July 1854) : 

George Simon Ohm(17 March 1789-6 July 1854)

Ohm`s Law theory : 

Ohm`s Law theory The current that a battery can push to a wire is analogus to the water flow that a pump push to the pipe.Greater pump pressure lead water flow rates and similarly greater battery voltages lead to larger electric currents. In the simplest case the current (I) is directly proportional to voltage (V).i.e. V=IR . Thus, a 12 volt battery leads to twice as much current as a 6 volt battery when each is connected to the same circuit

In a water pipe, the flow rate is not only determined by the pump pressure but is also affected by the length and the diameter of the pipe. Longer the narrower pipe offer higher resistance to the moving water and lead to smaller flow rates for a given pump pressure. A similar situation exsits in electrical circuits. In te electrical case, the resistance (R) is defined as the ratio of the voltage(V) applied across a pipe of material to the current (I) through the material or R=V/Iwhen only a small current results from a high voltage, there is a high resistance to the moving charge.Mathematically- : 

In a water pipe, the flow rate is not only determined by the pump pressure but is also affected by the length and the diameter of the pipe. Longer the narrower pipe offer higher resistance to the moving water and lead to smaller flow rates for a given pump pressure. A similar situation exsits in electrical circuits. In te electrical case, the resistance (R) is defined as the ratio of the voltage(V) applied across a pipe of material to the current (I) through the material or R=V/Iwhen only a small current results from a high voltage, there is a high resistance to the moving charge.Mathematically- OR

The copper wire in a television set for instance have negligible small resistance on the other hand commercial resistors can have resistance upon many kilo ohm(1kΩ=103 Ω )or mega ohm(1mΩ=106 Ω) such resistors play an important role in electric circuits. : 

The copper wire in a television set for instance have negligible small resistance on the other hand commercial resistors can have resistance upon many kilo ohm(1kΩ=103 Ω )or mega ohm(1mΩ=106 Ω) such resistors play an important role in electric circuits.

Ohm`s law circuit diagram : 

Ohm`s law circuit diagram

Ohm`s law is not valid for all the substances . therefore circuits are classified into 2 groups- Ohmic circuitNon-ohmic circuit : 

Ohm`s law is not valid for all the substances . therefore circuits are classified into 2 groups- Ohmic circuitNon-ohmic circuit

Ohmic circuits : 

Ohmic circuits The conductor in which ohms law is followed is called ohmic circuits,for such circuits I-V graph is a straight line passing through a origin. The slopes of the graphs is the resistance in the circuit.

For example : 

For example

Non-ohmic circuits : 

Non-ohmic circuits These circuits in which ohm`s law is not followed are called non-ohmic circuits.the I-V graph is not a straight line. For example electrolytes, semi conductors,etc. The resistance of the circuit varies with the variation in V and I.

Slide 11: 

For example

Slide 12: 

Presented byAnuj GargX-A8201M.A.S.D. Public School Thanxxxx