Monday 1st of August 2016
Subject:
Physics (Dynamic electricity)
Dynamic electricity consists of AC electric and DC electric . Dinamic electricity learn about current , voltage, resistance, electric circuit , Kirchoff law, ohm’s law, electris power, electric energy, transformer.
Many electric phenomena are around us.From the natural ones like lightinng and thunder to those generated by the power plants. Electricity in lightning and thunder are static electricity that is almost impossible to use. While the electricity from electric power plants is dynamic electricity that we can control and utilize it.
a. Serial Circuit of ResistorIn a series configuration, the current through all of the resistors is the same, but the voltage across each resistor will be in proportion to its resistance. The potential difference (voltage) seen across the network is the sum of those voltages, thus the total resistance can be found as the sum of those resistances:
b. Parallel Circuit of ResistorResistors in a parallel configuration are each subject to the same potential difference (voltage), however the currents through them add. The conductances of the resistors then add to determine the conductance of the network. Thus the equivalent resistance (Req) of the network can be computed:
C. Ohm,s Law
Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance one arrives at the usual mathematical equation that describes this relationship:V=I.Rwhere I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the currentThe law was named after the German physicist George Ohms, 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 (see History section below) to explain his experimental results. The above equation is the modern form of Ohm's law.
b. Parallel Circuit of ResistorResistors in a parallel configuration are each subject to the same potential difference (voltage), however the currents through them add. The conductances of the resistors then add to determine the conductance of the network. Thus the equivalent resistance (Req) of the network can be computed:
C. Ohm,s LawOhm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance one arrives at the usual mathematical equation that describes this relationship:V=I.Rwhere I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the currentThe law was named after the German physicist George Ohms, 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 (see History section below) to explain his experimental results. The above equation is the modern form of Ohm's law.
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