LEY DE OHM.

To understand Ohm's law is essential that we clarify the definition of power which we can point to as the passage of electrons transmitted through a conductor in a given time. Now, to know or determine the current passing through a conductor according to the opposition or resistance materials imposed on the electrons occupy this law called Ohm's law, which says that the electric current is directly proportional to voltage andinversely proportional to the electrical resistance. Ohm's law was named in honor of its discoverer, the German physicist George Ohm expresarsa by the formula I = V / R, where I is the current in amperes, V the electromotive force in volts and the resistance R ohms. Ohm's law applies to all electrical circuits, both current (DC) as the alternating current (AC)Now is also important to know what is a series circuit.
Is a series circuit in which electric current is only one way to reach the point of departure, regardless of the intermediates. electric current is the same at all points of the circuit.Ahead you can see a sketch of a circuit in series.
Where:
I = current source
V = voltage source
R = is the total resistance
R = the resistance i
V = the resistance R
When there are N resistors connected in series total circuit resistance is equal to the sum of the resistances. That is:
RT = R1 + R2 + R3 + ...
Example of how to calculate the resistance
It has a voltage source of 24 volts direct current (24 V DC) connected to the terminals of a resistor. Through an ammeter connected in series in the measuring current circuit and a reading of 2 amps. What is the resistance that exists in the circuit?
Applying Ohm's law we have: T / I = R
then replace:
24/2 = 12 R (ohms)
Resistors in Series Example
Have a DC 24V battery whose terminals are connected in series: a resistor R1 100 R, a resistor R2 100 R, and a third resistor R3 of 40 R. What is the total or equivalent resistance that is presented to the battery?
Have to RT = R1 + R2 + R3, so replacing the values ​​are:
RT = 100 +40 +100 = 240 R
This means that total or equivalent resistance that the battery "sees" at its terminals is 240 A.
Georg Simon Ohm (1787-1854)
The most basic and most used of all the laws of electricity, Ohm's law, was published in 1827 by the German physicist Georg Simon Ohm in his great work, The Galvanic Chain, treated mathematically. But Ohm's law we could not analyze the simplest galvanic chain, but when Ohm published work was described by critics as a tangle of obvious fantasies, whose sole purpose was to detract from the dignity of nature.Ohm was born in Erlangen, Bavaria, the eldest of seven children in a family of lower middle class. Soon had to withdraw from the University of Erlangen in 1811 but returned to get his doctorate and get the first of several modest and poorly paid teacher placements. To improve their lot, they ventured into their research power at every opportunity that allowed their heavy tasks of teaching, and their efforts culminated in his famous law. Despite the criticism out of place on his work during his lifetime Ohm received the fame that was due. The Royal Society of London awarded him the medal in 1841 Copely and the University of Munich awarded him the chair of Professor of Physics in 1849. He was also honored after his death when he chose the ohm as the unit of electrical resistance.