• # Proof the Ohm’s law as per class 10

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want Proof the Ohm's law as the per class 10.
Statement of Ohm's Law:
Ohm's law states that at a constant temperature, current 'I' through a conductor between two points is directly proportional to the potential difference or voltage 'V', across the two points. That is, this constant is called as the resistance (R) of the conductor.
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Set up a circuit as in Fig., consisting of a nichrome wire XY of length, say 0.5 m, an
ammeter, a voltmeter and four cells of 1.5 V each. (Nichrome is an alloy of nickel,
chromium, manganese, and iron metals).
First use only one cell as the source in the circuit. Note the reading in the ammeter I, for the current and the reading of the voltmeter V for the potential difference across the nichrome wire XY in the circuit.
Next connect two cells in the circuit and note the respective readings of the ammeter and voltmeter for the values of current through the nichrome wire and potential difference across the nichrome wire.
Repeat the above steps using three cells and then four cells in the circuit separately.
Calculate the ratio of V to I for each pair of potential difference V and current I.
In this activity, you will find that approximately the same value of V/I is obtained in each case. Thus the V-I graph is a straight line that passes through the origin of the graph Thus V/I is a constant ratio.
The electric current flowing through a metallic wire is directly proportional to the potential difference V, across its ends provided its temperature remains the same. This is called Ohm's law. In other wordsV I ? ….(i)
Or V I / constant ?
= ROr V = IR …(ii)
In equation (i) R is a constant for the given metallic wire at a given temperature and is
called its resistance. It is the property of a conductor to resist the flow of charges through it. Its SI unit is ohm, represented by the Greek letter ? . According to Ohm's law.
R = V/I …(iii)
If the potential difference across the two ends of a conductor is 1 V and the current
through it is 1A, then the resistance R , of the conductor is1? .
That is, 1 ohm = 1volt
1 ampere

Saket Kumar
Real Eyes Realize Real Lies.

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• Ohms law states that current (I) across a conductor is directly proportional to the voltage (V) applied across it if temperature and other physical conditions remain same. So the famous ohms law says I = V/R where R is known as the electrical resistance of the conductor or simply as resistance.

To proof ohms law the basic premises is the flow of electrons in a conductor which is actually current (I) that we measure in an electric circuit. So when a voltage is applied across a conductor we are creating an electric field due to which the electrons move and depending upon there mobility they will acquire a drift velocity.

To understand the matter in a simplified way the current in the conductor is directly proportional to this drift velocity which in turn is proportional to the applied voltage across the conductor. These two things when combined give the relation that current (I) is proportional to the applied voltage (V).

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Knowledge is power.

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Statement of Ohm's Law:
Ohm's law states that at a constant temperature, current 'I' through a conductor between two points is directly proportional to the potential difference or voltage 'V', across the two points. That is, this constant is called as the resistance (R) of the conductor.

Ohms law states that current (I) across a conductor is directly proportional to the voltage (V) applied across it if temperature and other physical conditions remain same. So the famous ohms law says I = V/R where R is known as the electrical resistance of the conductor or simply as resistance.

To proof ohms law the basic premises is the flow of electrons in a conductor which is actually current (I) that we measure in an electric circuit. So when a voltage is applied across a conductor we are creating an electric field due to which the electrons move and depending upon there mobility they will acquire a drift velocity.

To understand the matter in a simplified way the current in the conductor is directly proportional to this drift velocity which in turn is proportional to the applied voltage across the conductor. These two things when combined give the relation that current (I) is proportional to the applied voltage (V).

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• Ohm's Law
• Ohm's law states that, "The potential difference V across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same".
i.e V= I.R
• R is constant for a given metallic wire at a given temperature, and this constant is named resistance. It is the property of a conductor to resist the flow of charges through it.
• Its SI unit is ohm which is denoted as ?.
• If we plot the V-I graph for a conductor, then it shows a linear nature.
• The slope of the graph gives the resistance of the conductor.
• If the potential difference across two ends of conductor is 1 V and the current through it is 1 A, then the resistance of the conductor is 1 ?.
• In practice, the current needs to be increased or decreased. This is achieved by a variable resistor
called a rheostat.
• The motion of electrons/charges in a conductor is retarded by its resistance.
• A conductor offering less resistance is called a good conductor, and a conductor offering high resistance is called a poor conductor. An insulator offers a very high resistance.

Saket Kumar
Real Eyes Realize Real Lies.