Ham Radio India - VU2.IN

Ham Radio India. Radio Electronics. Disaster Management. Emergency Communication - Amateur Radio

  • Increase font size
  • Default font size
  • Decrease font size
Home

Basic Electronics - Ohm's Law

Probably the most important law in electronics is Ohm's Law.

Ohms Law:  The voltage across a resistor equals the resistance of the resistor times the current flowing through it (V = R* I).

Ohm's law applies to electrical circuits; and in other words can be stated as "The current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them" 

Thus if you have a resistance (R) of 1000 ohms and a current (I) of 10 milliamps flowing through it, the voltage (V) over it will be: 1000 * 0.01=10V.

Ohms law can be expressed in the following ways:

V = R * I
R = V / I
I  = V / R
where V is the potential difference measured across the resistance in units of volts; I is the current through the resistance in units of amperes and R is the resistance of the conductor in units of ohms.

The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. He presented a slightly more complex equation than the one above to explain his experimental results. The above equation is the modern form of Ohm's law.

Ohm's law, in the form above, is an extremely useful equation in the field of electrical/electronic engineering because it describes how voltage, current and resistance are interrelated on a "macroscopic" level, that is, commonly, as circuit elements in an electrical circuit.

If you would like to read more about Ohm's Law, it's history and origin, visit Ohm's Law on Wikipedia for the details on this fundamental law of electronics.

Another person who has contributed a great deal to electronics is Gustav Kirchhoff. Gustav Kirchoff gave the famous Kirchhoff's Circuit laws.

 

Amateur Radio Quiz

What is Capacitance Hat
 

QRZ Search

Please note: Search Ham Radio Operators callsign database. If your callsign doesn't show up, please fill up the form to add your callsign in our callsign database.

Basic Electronics Quiz

Public quizzes

Alexa Rank


Newsflash

Gwalior (India) HamFest 2013 to be held September 21st & 22nd

Hi All,

As informed in the earlier post Gwalior to host HamFest 2013, the dates for India's annual gathering of amateur radio operators have been announced and the annual eyeball meet of Indian Ham Radio Operators is scheduled for Sept 21st and Sept 22nd 2013.

Mark your calendars and get set for the event which will be held for the first time in northern part of the country.

About Gwalior: Gwalior is an ancient city, situated in the state of Madhya Ppradesh, on the Mumbai-Delhi railroad, and is located at a distance of about 300 km from Delhi. While you would plan to visit the city for Hamfest, do not forget to schedule a visit to Taj Mahal in Agra!