Swinburne's Test for D.C Motors is used to check the losses of any machine. It is a useful technique and it requires the following condition to be met:
Basic Definition of Compound Motor for Interviews
Today Electrical Engineering Fundamentals provides the basic definition of Compound Motor. Remember this in your interviews.
Voltage Divider: The Basic Concept With Mathematical Formula
One of the most important and basic concepts in Electrical Engineering is the Voltage Divider. This law states that:
In any series circuit of two resistors, the total voltage is divided on the basis of their resistance (RCE).
For example, consider two resistors (will use R afterwards to denote it) of 10 and 5 k each and lying in series (S). If a voltage source is providing 20 V, then it will be divided between them. The more the amount of RCE, the more will be the voltage dropped across it.
In present case 10 will receive a 13.33 V drop whereas 5 will receive a 6.66 V across it.
The basic formula which governs this amount is represented here:
The simple formula is very simple and easy to understand. One can easily expand this formula to any number of resistors. Suppose that we have 1, 2 and 10 RCS’s lying in the series configuration. The same formula for calculations will be used. However, in the present case, the third component will be added in the denominator.
Current Always Remains Same in Series Circuit: For any Value Either Same or Different
The current in any series circuit is same.
Yeah!
The fact is true for any value of the resistor (or any other electrical component).
As far as they are connected in series.
Imagine that we have two resistors connected as:
Yeah!
The fact is true for any value of the resistor (or any other electrical component).
As far as they are connected in series.
Imagine that we have two resistors connected as:
Now we can see that the first value is 10 ohm whereas another one is 5 ohm but the same value 1.33 A is flowing through both of these (Don't worry we will look into the proof of this fact).
Current in Parallel Circuits: The Basic Concept
In parallel circuits, the current (C) always divides.
Consider the cases when we have a source of 9A providing C to two resistors. Observe that 2k has 3 A across it whereas 1k has 6A flowing through it.
After observing above circuit we can state some basic laws:
In Parallel (will use || afterwards) config the C divides.
The amount of C is inversely related to the amount of R.
C will only divide if R are of different value. If we have both R's of 2k and 2k or both of 1k and 1k then C would also have been equal in the above case.
The Basic Concept of Voltage in Parallel Components:Potential Always Remains Same
In parallel circuit configurations (P.C.C) , the voltage is always constant. Suppose we have two resistors R1 and R2
Now if the first one has 5V then the second one will also have 5V across its terminals.
Now if the first one has 5V then the second one will also have 5V across its terminals.
The reason behind this is that in P.C.C the head and tail of components are connected with each other. Whenever the head and tail are at the same point, the potential is also same.
Ohm's Law
Ohm law is a simple relationship between three quantities Current, Voltage and Resistance.
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