Informations On Electricity, Part 2 | From - Expert Contractors

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Resistance is the friction or opposition to the tide of stream by the wires and transformers, analogous to plumbing installation, where the drift of water is subjected to resistance caused by friction between the water and the inside wall of the channel, and the several form of turns and equipment. For train tide (DC electricity), the word Resistance is used for friction and Impedance for alternating drift (AC electricity).

Factors that Influences Conductors Resistance.

1. Compostion of the Conductor. This refers to a conductor having free electrons that has low resistance.

2. Length of Wire. The longer the wire, the higher is the resistance.

3. Cross Section Area of Wire. The bigger the cross sectional area of wire, the lower its resistance.

4. Temperature. Metal offers high reistance to high temperature (heat).

1.3 Electric Current

By definition, Electric Current is the flow or rate of flow of electric force in a conductor. A current will only flow if a curcuit is formed comprising a complete loop and contains all the following required components.

1. Source of Voltage
2. A closed loop of wiring
3. An electric load
4. A means of opening and closing the circuit

Electric Current is Classified as:

1. Direct Current (DC)
2. Alternating Current (AC)

Direct Current. The DC electricity, flows in one direction. The flow is said to be from negative to positive. The normal source of a DC electricity, is the dry cell or storage batter.

Alternating Current. The AC electricty constantly reverses its direction or flow. It is generated by machine called generator. This type of current is universally accepted because of its unlimited number of applications which the following advantages.

1. It is easily produced.
2. It is cheaper to maintain.
3. It could be transformed into higher voltage.
4. It could be distribution to far distance with low voltage drop.
5. It is more efficient compared with the direct current.

Once a big controversy ensued between the proponents of the DC electricity led by Thomas Edison and the advocates of the AC electricity led by George Westinghouse. According to Thomas Edison, "The AC electricity is dangerous, because if involves high voltage transmission line."



The AC advocates on the other hand, countered that:

"The AC alternation is just like a handsaw which cuts on the upstroke and the down stroke. The high voltage in the transmission line could be compact to the preferred voltage as it passes the distribution line."

Alternating Current or Voltage is a recent or voltage that changes in forte according to a sine curve. An alternating tide AC reverses its split on each alternation and reverses its direction of flow for each alternation. The AC current goes through one convinced sphere and one downbeat ring to form one complete rotation that is continually frequent.

The number of periods this cycle of boon and minus ring strike per back is called the Frequency of alternating current AC uttered in cycles pre moment usually termed Hertz (hz) named after H. R. Hertz. The frequency of the Direct Current DC is visibly nought Hertz. The voltage is even and never changes in polarity.