Ohm's Law is one of the basic tenets of physics.The general formula, which is valid for the full circuit, and for its area, said that the current is equal to the quotient obtained by dividing the value of expressing volts, the value of expressing the strength of the current in amperes.This relationship shows that at lower current resistance increases.The question arises: is it possible to get the most current, reducing the resistance to zero?Practice shows that this is impossible.Ohm's Law for the complete chain indicates that the voltage must be divided by the total, combined resistance is calculated as the sum of the resistance of the external and internal resistance-dependent current source.Reduce the internal resistance of the system to zero is not possible.Otherwise battery explosion probability is very high.
What is the internal and external resistance, which says Ohm's law for the complete chain?If, for example, is connected to the lamp circuit, the resistance is outside of this bulb.Internal resistance always comes from the battery that is generated within the system itself.If the battery is used in place of a galvanic cell, Ohm's law to take into account the entire chain of the resistance of the electrodes and the electrolyte solution.If the external resistance of a fraction of the inner and wherein the circuit is closed, then it flows by the short circuit current.This is the maximum value of current that can flow through this circuit.Current sources in the car shows the values of the short-circuit current, critical life-threatening.For security reasons, it is connected to external devices, batteries with sufficient resistance to prevent the tragedy.
When connecting the total internal resistance of the circuit is calculated by adding the resistance of each of the current sources.When connected in parallel, the voltage at each of the sites otvetvlёnnyh has the same value, and the current in the unbranched chain is calculated by adding the values that show ammeters on each of the sites connected in parallel.The power source located on the circuit does not exert any influence on the parallel portion connected to it.
Where to apply Ohm's law for a complete circuit?Preferably they are used to calculate the current in the linear electric DC circuits.To perform the calculations correctly, it must be remembered postulates Kihgofa.First, the algebraic sum of the current strength, the node being zero.Secondly, the algebraic sum of the product of current force in any closed-loop chain and branched portions of the resistance circuit is always equal to the algebraic sum of the detected voltage in the circuit.
Under what circumstances, how and when was discovered Ohm's law for the complete chain?Swiss researcher Georg Ohm came to the now well-known throughout the world formula empirically.He studied the magnetic effect of current and experimented with a variety of generators used in their experiments wires of different metals and alloys.Om became the first physicist, noted the impact resistance conductors of heat.Ohm's Law for the complete chain has been recognized by the scientific community at once.The first scientist to appreciate the law, have become Russian researchers Jacobi and Lenz.American John. Henry later compared the formula expressing Ohm's law for a complete circuit with lightning in the midst of a gloomy empty room, and a German professor E. Lommel called the opening "a bright torch in the field of electricity."
