Definition and Source of Direct Current Power
Direct Current Electricity: Understanding, And Sources With Complete Examples of Problems
Electricity comes from the word electron, which means amber. If an amber is rubbed with silk cloth, it will be able to pull light objects such as paper scrap. From this it is said the amber is electrically charged.
The charge is the basic characteristic of all the constituents of matter. Substances are composed of protons, neutrons and electrons. Electrons have negative charges and protons have positive charges. The amount of electric charge (denoted by Q) possessed by an object, simply shows how less or more the number of negative charges compared to the number of positive charges.
Understanding Direct Current Electricity
Direct electric current (Direct Current or DC) is the flow of electrons from a point with high potential energy to another point with lower potential energy.
Direct current was once thought to be a positive current flowing from the positive end of the source of electric current to the negative end. More recent observations have found that actual direct current is a negative current (electron) that flows from the negative pole to the positive pole. This flow of electrons causes positively charged holes, which "seem" to flow from the positive pole to the negative pole.
An example of the use of direct current electricity is the distribution of the first commercial electric power (made by Thomas Alfa Edison in the late 19th century) using direct current electricity. The world's first commercial generator also uses direct current electricity.
In 1883, Nicola Tesla was awarded a patent for his invention, the alternating current of many phases. In May 1883 he delivered a classic lecture to The American Institute of Electrical Engineers: "A New System of Alternating Current Motors and Transformers."
Because alternating current electricity is easier to use than direct current electricity for transmission and distribution of electric power, today almost all electric power transmissions use alternating current electricity.
Even so, at the first launch of alternating electric current, direct current is still used. Some even do not want to accept alternating current.
With the development of current electronic technology, direct current electricity (DC) can be generated by changing alternating current (AC) into Direct Current (DC) using a device called a Power Supply or Adapter.
As the basis of the Power Supply circuit is a diode component that can function as a rectifier, meaning that it can change and direct alternating current (AC) into Direct Current (DC).
Electric symptoms
Coulomb's Law
Understanding electric charge shows that the charge does not spread to a particular area but rather gather in one point. In 1785 Charles Coulomb conducted the first study of the force exerted by two charged objects with an instrument called the coulomb twisting balance.
Coulomb twisting balance
From the results of these experiments, Coulomb concluded:
The magnitude of the interaction force between two electrically charged point objects is directly proportional to the multiplication between each charge and inversely proportional to the square of the distance between the two point charges.
Large interaction force in mathematical equations
Interaction style between loads
it was concluded that the existence of coulomb forces on the + Q and + q charges, in that space there is an electric field. For the -Q charge and put the + q test load, there will be a coulomb force that is tugging between the two charges.
Difference Between Direct Current and Alternating Current
The most fundamental difference from direct current and alternating current is located in the direction of the current. The direction of the direct current flows in one direction while the direction of the alternating current flows in two directions.
The form of direct current (AC) is a straight graph (the voltage is fixed with time). Graphical form of alternating current is siusoidal which means the voltage changes with time.
Direct electric voltage produces a small electrical voltage so that it can only be used on electronic devices that require small electrical energy. The alternating voltage produces a large voltage so that it can be used for electronic devices that require large electrical energy.
Direct current source of electricity from PLN. DC source from dry batteries and batteries.
Examples of Direct Current Power Problems
10 pieces of electrical resistance arranged as shown below! Each obstacle is identical and the magnitude is 120 Ω.
Determine the replacement resistance (total resistance) between points A and B from the circuit image above!
Discussion
The parallel between R2 and R3 is named R23 of 60 Ω
The parallel between R4, R5 and R6 is called R46 of 40 Ω
The parallel between R7, R8, R9 and R10 is called R710 at 30 Ω
Series between R1, R23, R46 and R710 produces RAB
RAB = 120 + 60 + 40 + 30 = 250 Ω
So, the replacement resistance (total resistance) between points A and B is 250 Ω