Best Topics for Electrical Engineer

In this tutorial, we are going to learn about Best Topics for Electrical Engineer.

What is Current?

  • Movement of called Electricity, Simply it is electronics called current.
  • If a charge is forced to move because of a potential difference (voltage) current is produced.
  • In conductors-free electrons can be forced to move, while they require little work to be moved.
  • So current is charge in motion.

What is Amperes?

  • Current indicates the intensity of the electricity in motion. The symbol for current is (for intensity) and is measured in amperes.
  • Current is invented by Amperes so unit of current is ampere.
  • The definition of current is equal to I =Q/T.
  • Where I is current in amperes, Q is charge in coulombs, and T is charge in coulombs, and T is time in seconds

What is Voltage?

  • Movement of electron is called Electricity. We need some force move Electron from one place to place that force in Electrical term is called “VOLTAGE” or “ELECTRO MOTVIE FORCE”
  • For voltage, Potential refers to the possibility of doing work.
  • The symbol for potential difference is E (for electromotive force).
  • It is also called unit of potential difference is the volt (V)
  • I volt is a measure of the amount of work required to move IC of charge.

What is Closed Circuit?

  • In applications requiring the use of current, electrical component are arranged in the form of a circuit.
  • A circuit is defined as a path for current flow.
  • If one circuit forms the closed path only that circuit will work.

What is Open Circuit?

  • Current can only exist when there is conductive path. In the circuit =0, since there is no conductor between points a and b. we reoffered to this is as an open circuit.

What is Direct Current?

  • Current that is powered by battery sources are termed direct current circuits.
  • It is the flow of charge in just one direction so no frequency.
  • Example: – Battery and Solar cell output and DC generator.

What is Alternating Current?

  • An alternating voltage source periodically alternate or reverses in polarity.
  • Frequency (Eg:-50Hz or 60Hz) it’s decided by power generation Station.
  • In our how house maximum all appliances working in AC supply.

What is Resistance?

  • It is use to opposition to the flow of current is termed resistance and it is Bidirectional component.
  • When a wire can become hot from the flow of current is evidence of resistance.
  • Conductors have very little resistance.
  • Insulators have large amounts of resistance.
  • Unit of Resistance is Ohms.
  • Voltage, current and resistance are related through Ohm’s law, resistors are a good way to control voltage and current in your circuit.

Resistor Color Code Band:

  • Resistor color codes
  • 1stband = 1st number
  • 2ndband = 2nd number
  • 3rdband = # of zeros/multiplier
  • 4thband = tolerance

What is Ohm’s Law?

  • When the amount of current flow in a circuit which is dependent on its resistance and the applied voltage. Specifically I =V/R.
  • If you know any two of the factors V.I, and R you can calculate the third.
  • It can be applied to both AC and DC circuit. Its apply Linear circuits.
  • For DC Circuits-

   V-IR in Volts

Current I = V/R (For DC)

Voltage V = IR (For DC)

Resistance R = V/I (For DC)

  • For AC Circuits:-
  • V = IZ in Volts
  • I=Current flow in the circuit in amps
  • Z=Impedance in the circuit Ohms = f(XL2 + XC2)
  • XL=Inductive Reactance = 2IIFL in Ohms
  • XC= Capacitive Reactance=1/(2IIFc in ohms.

What is Power?

  • The unit of power is watt (W).
  • It is called when any works is done over time.
  • Power is divided in Real power. Reactive power and Apparent Power (Explain in another video)
  • One watt of power is equal to the work done in one second by one volt moving one coulomb of charge. When one coulomb a second then it is an ampere.
  • Power in watts = volts x amperes (Real Power).
  • P = V x I in watts
  • P = I2 x R in watts
  • P = V2/ R in watts

What is Capacitors?

  • A capacitor stores electrical energy.
  • Capacitance is measured in Farads. The small capacitors usually used in electronics are often measured in microfarads and nano farads.
  • Electrolyte capacitor stores energy in the electrical field between its plates.
  • Some capacitors are polarized. Note the different length terminals on one the capacitors.
  • The shorter terminal of capacitor goes on the negative side (cathode).

What is Diode?

  • It is a one way valve for electricity and component with an asymmetrical transfer characteristic. A diode has low resistance (Ideally zero resistance) in one direction and high resistance (infinite resistance) in the other direction. Rectifier circuits and so many circuits diode used.
  • Diodes will protect your electronics.

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