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.
How to Identify Any Resistor: The Color Code Method for Identification
In Electrical Engineering, the most commonly used component is resisor.
Graphically we can represent it by sketching a zig-zag line or a boxed shape and by writing its ohm value in mathematical form over it.
But practically how to identify that one component out of other thousands has 10 Ohm value.
To solve this problem the concpet of color codes is used. Based on this for each mathematical number a specific color is assigned by which user can visually understand the amount of each component.
Graphically we can represent it by sketching a zig-zag line or a boxed shape and by writing its ohm value in mathematical form over it.
But practically how to identify that one component out of other thousands has 10 Ohm value.
To solve this problem the concpet of color codes is used. Based on this for each mathematical number a specific color is assigned by which user can visually understand the amount of each component.
Resistor
Resistors are Electrical components that are used to reduce the amount of current in any circuit. Remember that in circuit we always want to reduce the amount of current and to keep it withing the rated limits. If resistors are not used then the working assembly (any thing on which we are performing experiment) will burn away.
The quantity used to identify this component is resistance. The more resistance a component has the less will be the amount of current flow.
So in any circuit we can use our desired amount based on the need of that experiment. The normal Engineering prefixes are used to denote the resistors.
The quantity used to identify this component is resistance. The more resistance a component has the less will be the amount of current flow.
So in any circuit we can use our desired amount based on the need of that experiment. The normal Engineering prefixes are used to denote the resistors.
How To Solve Two Resistors in Parallel: Simple Mathematical Formula
Previously we learnt that two resistors are in parallel, if they share same head and same tail.
To solve such configuration and to find the equivalent answer, we can use the following formula.
To solve such configuration and to find the equivalent answer, we can use the following formula.
How to Solve Resistors in Series
The resistors in series can be solved by simply adding them.
The process is same for as many resistors you use.
Parallel Circuit Configuration: What is this and How to identify it?
A parallel circuit contains two or more elements whose head and tail both have common points. The graphicall image displaying this arragnemnt is shown below.
Simple Series Circuit: What is this and How to Identify Components in this Configuration
A simple series circuit is the one having two elements arranged in such way that head of one connects the tail of other.
Clearly you can see in above figure that head of R2 connects the tail of R1.
The above case is a strict and only condition for series.
The head of first should never be connected with the tail of second.
In cases the above statement is not fulfilled then the connection is never in series.
The above case is a strict and only condition for series.
The head of first should never be connected with the tail of second.
In cases the above statement is not fulfilled then the connection is never in series.
Electrical Circuit Diagram: What Are These And Why Are They Used
Electrical Engineers use the circuit diagrams. These are used to graphically represent the configuration of any circuit. Different type of components has different circuit diagrams.
Here is a figure which displays different examples.
The above image is just for illustration process. You are not required to learn or remember them.
Here is a figure which displays different examples.
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| A Screenshot of Circuit Diagram Taken Over Google |
Most Commonly Used Power of 10 Prefixes in Electrical Engineering
In Electrical Engineering, the power of 10th prefixes are most commonly used to identify the quantities. A list of most commonly used prefixes is shown below.
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