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Ohm's Law
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Ohm’s law

  2. 2. GEORGE SIMON OHM {1787-1854} Georg Simon Ohm was a German physicist born in Erlangen, Bavaria, on March 16, 1789. Ohm’s main interest was current electricity, which had recently been advanced by Alessandro Volta’s invention of the battery. Ohm made only a modest living and as a result his experimental equipment was primitive. Despite this, he made his own metal wire, producing a range of thickness and lengths of remarkable consistent quality. The nine years he spent at the Jesuit’s college, he did considerable experimental research on the nature of electric circuits. He took considerable pains to be brutally accurate with every detail of his work. In 1827, he was able to show from his experiments that there was a simple relationship between resistance, current and voltage. .
  3. 3. OHM’S LAW Acc. To Ohm’s Law, if the conditions are unchanged (like – temp.), the potential difference flowing through the two ends of the conductor is directly proportional to electric current flowing through it & the electric current is inversely proportional to the resistance. V is the voltage of the resistor, measured in Volts (V). In some cases Ohm's law uses the letter E to represent voltage. E denotes electromotive force(emf). I is the electrical current flowing through the resistor, measured in Amperes (A) & R is the resistance of the resistor, measured in Ohms (Ω).
  4. 4. When we know the voltage & current , we can easily find the resistance of that particular circuit by ohm’s law i.e V=IR so, R= V R The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A) When we know the resistance & current, we can easily find the voltage of that particular circuit by ohm’s law : V=IR The voltage V in volts (V) is equal to the to the current I in amps (A) times the resistance R in ohms (Ω):
  5. 5. FACTORS ON WHICH STRENGTH OF ELECTRIC CURRENT DEPEND As earlier stated, since the current is directly proportional to the potential difference applied across the ends of a conductor, it means that if the potential difference across the ends of a conductor is doubled, current flowing through it also gets doubled, and if the potential difference is halved, the current also gets . On the other hand, the current is inversely proportional to resistance. So, if the current is doubled the current gets halved, and if the resistance is halved, the current gets doubled. Thus, the strength of an electric current given conductor depends on two factors : I. potential difference across the ends of the conductor, and II. resistance of the conductor.
  6. 6. RESISTANCE OF A CONDUCTOR The electric current is a flow of electrons through a conductor. When the electrons move from one of the conductor to the other part, they collide with other electrons and with the atoms and ions present in the body of the conductor. Due to these collisions, there is some obstructions or oppositions to the flow of electronic current through the conductor. The property of a conductor due to which it opposes the flow of current through it is resistance of a conductor is numerically equal to the ratio of potential difference across its ends to the current flowing through it. The resistance of a conductor depends on length, thickness, nature of the material and temperature, of the conductor. A long wire (or a conductor) has more resistance and a short wire has less resistance. Again, a thick wire has less resistance whereas a thin wire has more resistance. Rise in temperature of a wire (or a conductor) increases its temperature. The SI unit of resistance is Ohm which is denoted by a Greek letter
  7. 7. ONE OHM {Ω} The unit of resistance is ohm, can be defined by using Ohm's Law: Acc. To Ohm’s Law, Potential diff./Current = Resistance (at constant) So Resistance {R}, R= V/I SO, if the potential difference V is 1 volt and the current I is 1 ampere, then resistance R in the above equation becomes 1 ohm. Mathematically, 1 OHM = 1 VOLT / 1 AMPERE This gives us the following definition for ohm : 1 ohmis theresistanceof a conductorsuchthatwhena potentialdifferenceof 1 voltis appliedto itsends,a currentof 1 ampereflowsthroughit.
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description of ohms law in a simple way...


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