Electrical learn easily

 Ammeter:  In series connection, the same current flows through all the components. Ammeter aims at measuring the current flowing through the circuit and hence, it is connected in series: so that the same current that is there in the circuit flows through it and gets measured. Ammeter has a low resistance, because we do not want to change the current that is flowing through the circuit. Voltmeter:   Voltmeter measures voltage change between two points in a circuit. So u have to place the meter probes at these two points, without removing the portion of circuit between the probes (or else you change the circuit). This then, by definition, places the voltmeter in parallel with the section of circuit between the probes. When you place the meter probes at the two points you want to measure, a tiny portion of the current in the circuit will now go thru the meter and give you a reading. We make the voltmeter a very high resistance instrument. So when the current splits into the meter the hig

 What is Voltage and Current What is Electric Current ? An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit.The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes. The basic concept of current is that it is the movement of electrons within a substance. a electrons are minute particles that exist as part of the molecular structure of materials. Sometimes these electrons are held tightly within the molecules and other times they are held loosely and they are able to move around the structure relatively freely. One very important point to note about the electrons is that they are charged particles - they carry a negative charge. If they move then an amount of charge moves and this is called current. It is also worth noting that the number of electrons that able to move governs the ability of a particular subst

  Selecting cable The following are some points you should consider when selecting cable for a particular application: 1. Current carrying capacity Each component or appliance connected to a circuit will have a current draw associated with its operation and it is important that the cable supplying power to these is capable of carrying the normally expected current, plus a margin of safety. If it is not capable then it is likely to result in the cable becoming hot and potentially catching fire. Although fuses are used in the circuit to protect the cable, the cable itself should be of an adequate rating to prevent this over-heating occurring under normal circumstances. You might find it useful to read our Electrical Circuit Basics article for using the equation I = P/V where the following example is given: If we wanted to wire up a light that we know has a power rating of 50W, then using I = P/V the current draw would be 50W/12V = 4.17A.   This tells you that you could use a cable with a

  Vacuum Circuit Breaker A breaker which used vacuum as an arc extinction medium is called a vacuum circuit breaker . In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter. The arc is extinct as the contacts are separated in high vacuum. It is mainly used for medium voltage ranging from 11 KV to 33 KV. Vacuum circuit  breaker  has a high insulating medium for arc extinction as compared to the other circuit breaker  .  The pressure inside the vacuum interrupter is approximately 10 -4   torrent and at this pressure, very few molecules are present in the interrupter. The vacuum circuit breaker has mainly two phenomenal properties. High insulating strength: In comparison to various other insulating media used in circuit breaker vacuum is a superior dielectric medium. It is better than all other media except air and SF 6 , which are employed at high pressure. When an arc is opened by moving apart the contacts in a vacuum, an interruptio

  Introduction of electrical generator An electric generator is a device which is used to produce electric energy, which can be stored in batteries or can be directly supplied to the homes, shops, offices, etc.  Electric generators work on the principle of electro magnetic induction  .  A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet . The conductor coil along with its core is known as an armature. The armature is connected to a shaft of a mechanical energy source such as a motor and rotated. The mechanical energy required can be provided by engines operating on fuels such as diesel, petrol, natural gas, etc. or via renewable energy sources such as a wind turbine, water turbine, solar-powered turbine, etc. When the coil rotates, it cuts the magnetic field which lies between the two poles of the magnet.  The magnetic field will interfere with the electrons in the conductor to induce a flow of electric curre

  What is the Purpose of a Transfer Switch ?  A automatic transfer switch (ATS) is a gadget that transfer a force supply from its essential source consequently to a reinforcement generator when it detects a disappointment or blackout happening in the essential source until utility force is reestablished.  The ATS is associated with both essential and reinforcement power sources, and fills in as a delegate between the force sources and your structure or hardware, going about as an electrical transfer. An ATS can likewise go about as a repetitive, rack-mounted force supply for hardware that is associated with a force source with just one line.  How does an transfer switch work?  The main breaker in the transfer switch switches the force source from your utility capacity to a backup generator. The structure can't be associated with both the generator and utility force simultaneously. The main breaker moves power from one source to the next. This forestalls the generator power from bac