KIRCHHOFF'S LAW

Kirchhoff's law:

1.Kirchhoff's current law:

According to this law it is known that the sum of currents flowing into a junction is equal to the sum if currents flowing outside the junction,in a given circuit.

In this given circuit we can see that 'N' is the junction and the currents I(1),I(2),I(3) are flowing towards the junction and current I(5),I(4) are flowing outwards.

And according to Kirchhoff's current law we can say that,

I(1)+I(2)+I(3)=I(5)+I(4)

2.Kirchhoff's Voltage law:

This law states that in a given circuit the Algebraic sum of all the voltages is equal to zero.

Here,if suppose imagine that current is flow in clockwise direction and in case of V(s) we can say that current is flowing from (-) to (+) terminal that means there is a rise in its potential and hence V(s) is taken as a (+) voltage and in case of V(1),V(2) and V(3) the current is flowing from (+) to (-) terminal that means there is drop in its potential and hence V(1),V(2),V(3) are taken as (-) voltages.
So according to Kirchhoff's Voltage law ,

V(s)+[-V(1)]+[-V(2)]+[-V(3)]=0
V(s)-V(1)-V(2)-V(3)=0

Comments

GENERATOR

GENERATOR: A Generator is a machine which converts Mechanical energy into Electrical energy.These are widely used inside the Power plants for the generation of Power. Generator In general the Generator we see in a Thermal power plant gains its mechanical energy from the Turbine connected to it and this mechanical energy is thus converted into the required Electrical energy by the Generator.I myself experienced a 15 days of internship in a Thermal power plant and the Generator was about the size of a lager hall both in its length and breadth and the output Electrical energy is thus achieved by the use of a Generator.

SWITCHING TRANSIENTS IN TRANSFORMER

Switching Transients: The word Transients is always very Scary for me but not any more hahaaa...........what about you???? Well coming to the point...why do these Switching Transients occur in a Transformer. When the switch is closed when the voltage is maximum...then the flux required by the core is zero and the available flux in the core is also zero and hence NORMAL OPERATION is sufficient When the switch is closed when the voltage is crossing zero...then the flux required by the core is maximum but here the avaliable flux in the core is zero and hence TRANSIENT OPERATION is required Here when the Transient operation takes place then the flux doubles gradually and this is known as Doubling Effect of Transformer.This Doubling Effect causes magnetic in rush current and Damage in the insulation. Using Secondary Harmonic Restraining Coil can reduce all these Drawbacks.

ELECTRIC HUB

Search This Blog