A. Kirchoff’s Law
Kirchoff law concerning the properties of a connection point and the nature of a loop or voltage in an electrical circuit. In accordance with the object being observed, the two were introduced by Kirchoff’s law, namely: Kirchoff laws of flow (Kirchoff’s Current Law, abbreviated KCL) and Kirchoff law of voltage (Kirchoff’s Voltage Law, abbreviated KVL)
B. KCL or Dot Law.
Kirchoff’s current law on commonly also called Dot law or the law of Kirchoff I. In any electric circuit, the algebraic sum of currents that meet at a connection point is equal to zero. The sum total of current toward percabangana point is zero. Branching point is the meeting point of three or more current or voltage source to the circuit and also from elements of the circuit or source tegangan.Dalam this law, used an agreement that the current written to the branching point with a positive sign and the current does not go (leave the branching point) written with a negative sign.
3:33 image Dot Law
3:36 image obtained from the current equation as follows:
+ I1 + I2 + (- I3) + (- I4) + (-I5) = 0
I1 + I2 – I3 – I4 – I5 = 0
I1 + I2 = I3 + I4 + I5
So the amount of current into the connection point = total outflow of the point
C. KVL
The algebraic sum of the product of the current and the resistance of each conductor / resistor inside any closed electrical circuit plus the sum of the emf or voltage source that is in the circuit is equal to zero.
So: Σ Σ IR + U = 0
Caution:
Signs of Decline voltage (voltage drop) in the resistor depends on the direction of current through it, but do not depend on the polarity of the voltage source (U) is in the circuit.
3:34 Down Voltage picture in Resistor
If the voltage is read from + to -, to read the same direction with the direction of current I flowing, then the price of V = RI is the voltage drop. To understand give a positive sign (+) to V and give a positive sign (+) at the RI. Meanwhile, if the voltage readings opposite to the current direction mark (-) V or (-) RI. As for the sumer voltage or current source applies the following provisions:
3:35 images Source Voltage
When the direction of reading from a to b, then it is a positive mark-lowering voltage in V. Or in other words, if obeyed the direction of reading + from the voltage source, V wrote positive. Reverse if reading from the poles – hence the voltage source V is written with a negative sign.