By applying the law of Kirchoff’s voltage loop equation we get the following:
Note the polarity on each element in the loop, namely:
– Negative when in accordance with the direction of the loop
– Positive if the fight against the direction of the loop
– U1 + I1.R1 + I1.R2 + I1.R3 + U2 = 0
or
I1.R1 + I1.R2 + I1.R3 = U1 – U2
Consider a closed circuit (Loop) ABCDA following:
Pictures 3:36 Loop ABCDA
Guidelines for estimating the current direction:
In applying the Law of Kirchoff voltage on an electrical circuit is closed, then we can estimate the direction of the current in each branch according to our wishes. It means we can estimate the direction of the flow as clockwise or counter-clockwise. If the voltage generated equation has been solved, and the results of the calculation to obtain a negative sign means that the current direction we think is wrong.
But when the results perhitunganya obtain positive results, shall mean the current direction we think is correct according denag actual direction. For purposes of analysis, the circuit is more complicated and complex, then the application of Kirchoff’s Law more effectively and help than just using Ohm’s Law. When the series circuit commonly applied to the system control circuit, the parallel circuit is commonly applied to the power circuit system to distribute electrical energy to an electrical equipment including refrigeration and ventilation equipment.
In order to operate properly, then any electrical load to be connected to the mains power supply separately or in a parallel circuit, so that each load can receive full voltage.
Parallel circuits used in power circuits that distribute electrical loads, such as heating, refrigeration and ventilation systems. Electric load on a system must be connected to the mains power supply in parallel, in order to obtain full voltage.
Figure 3.37 shows an example of a parallel circuit consisting of three resistors.
Figure 3.37 3 Parallel circuit Resistors