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Important Electrical Electrical Units

Wednesday, 20 August 2014

1.SI unit of megnetic flux is Weber

2. Unit of magneto motive force is Ampere-Turn

3.CGC unit of magneto motive force Gilbert

4.The unit of flux is in CGS system is Maxwell

5.Flux density is measured in Tesla

How Power Plants Work

Tuesday, 1 April 2014

How Power Plants Work

Electricity is actually the flow or movement of electrons through a material. Electric generating plants typically produce electricity using magnetic conduction. This happens when a large number of conductive wires are spun around inside a magnetic field, causing electrons to move (i.e., electricity to flow).
In a generating plant, the potential energy of various types of fuels (fossil, nuclear, or renewable) is converted into another form of energy (usually mechanical or heat energy). This energy is used to turn fan-like blades inside a turbine. These blades are attached to a pole-like shaft. When the blades inside the turbine begin to turn, the shaft begins to turn. This causes wires located inside a magnetic field within the generator to turn. The resulting flow of electrons is electricity. More or less electricity can be created by varying certain factors including: the type of materials used in the wire, the speed at which the turbine rotates, the size of the magnetic field, and the number of wire coils inside the magnetic field, among others.
Wires coming from the generator are used to conduct the flow of electricity out to a neighboring switchyard, where the electricity is “stepped up” (i.e., the voltage is raised) so that it can be sent to customers.
Steam-electric plants produce electricity by using heat energy to turn water into steam. The highly pressurized steam then travels through pipes to the blades in the turbine. When the steam hits the turbine, it causes the blades to spin.
Hydroelectric generating facilities use mechanical energy (i.e., the movement of water) to cause the blades in the turbine to turn.
In a steam-electric solar generating facility, heat from the sun’s rays is used to create the steam that is needed to rotate the turbine.

Magnetic Circuits Short Mcq Questions Answers

Sunday, 19 January 2014

Magnetic Circuits Short Mcq Questions Answers

Magnetic Circuits Important Terms

1. Magnetomotive Force (m.m.f): It is magnetic pressure which sets up or tends to set up flux in a magnetic circuit. When electric current is passed through a winding wound  on a core, a magnetic field is produced in the core. The product of current and number of turns of the coil is equal to m.m.f.
m.m.f = N I Ampere-turns (AT)
Adding turns of wire to a coil has the same effect as increasing the current flow. For Example, a one-turn coil with 1 A of current flowing in it produces the same m.m.f as a 10-turn coil with only 0.1 A of current flow. Therefore, effective m.m.f. of a magnetic circuit is equal to the product of the number of turns and current.

Capacitance MCQ Short QUESTIONS ANSWERS Part 2

Thursday, 16 January 2014


Any conducting object connected to earth is said to be grounded. Explain :

The earth is an electron source or sinks and is arbitrarily said to be zero potential. A conducting body connected to earth is also at zero potential or ground potential. Alternatively, the capacitance of the earth is so large that removal of electrons from it or supply of electrons to it makes no difference either in the charge or potential of earth.

Capacitance MCQ Short QUESTIONS ANSWERS Part 1

     CAPACITANCE MCQ Short QUESTIONS ANSWERS 4 Job University Admission Test

  • The two charged conductors are touched mutually and then separated. What will be the charge on them?

              The charge on them will be divided in the ratio of their capacitances. We know that q= CV.
              When the charged conductors touch, they acquire the same potential. Hence q C 

  • The plates of a charged capacitor are connected to a voltmeter. If the plates of the capacitor are separated further, what will be the effect on the reading of the voltmeter?

                             V= q/C and C= 0 A/d
            As the capacitor plates are separated, C decreases. Since charge on the plates remains the  
            same, value of V increases. Hence, the reading of the voltmeter will increase.


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