What is a Resistor? What are the Types of Resistors? What are the Applications of Resistor?

What is a Resistor? A resistor is a passive two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in accordance with Ohm's law. The electrical resistance is equal to the voltage drop across the resistor divided by the current through the resistor.  Figure 1: A typical axial-lead resistor. Figure 2: Two common schematic symbols of resistor. In...

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EEE Interview Tips Awarded Top 60 Electronics Websites & Blogs For Electrical & Electronic Engineers.

Recently, a website named Feedspot.com was published a survey regarding 'The best Electronics Blog on the Planet', which ranks 60 blogs from thousands of top Electronics blogs in their index using search and social metrics. According to the survey, EEE Interview Tips blog comes in at the 51th spot out of 60 blogs. The blogs are ranked based on following criteria: Google reputation and Google...

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Describe a Starter-Motor Circuit.

Figure 1: Typical Starter-Motor Circuit. A Starter-Motor Circuit:  Figure 1 shows a very simple diagram of an engine starter-motor circuit. If one day you turn on the ignition switch, push the start button, and nothing happens, this is the circuit diagram you will need. A complete engine wiring diagram would probably contain the same information, but it would also contain all of the meters, idiot lights, and alternator wiring, adding...

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Wiring Symbols

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The Discovery of Electricity Timeline.

The Discovery of Electricity: Schematic diagram of a copper–zinc voltaic pile. v   Democritus (460?–370? BC) proposes an “atomic theory” wherein all matter is made up of indivisible particles, or atoms. v   Charles de Coulomb (1736–1806) discovers that the force of attraction between electric charges is proportional to the product of the two charges and inversely proportional ...

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What is the difference between Electric Motor and Electric Generator?

Difference between Electric Motor and Electric Generator:  A generator converts mechanical energy to electrical energy, while motor converts mechanical energy to electrical energy.  In a generator, a shaft attached to the rotor is driven by a mechanical force and electric current is produced in the armature windings, while the shaft of a motor is driven by the magnetic forces developed between the armature and field; current has to be supplied to the armature winding.  Motors (generally a moving charge in a magnetic field)...

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What are the Advantages of Integrated Circuits (ICs)?

Advantages of Integrated Circuits: The major advantages of integrated circuits over those made by interconnecting discrete components are as follows: Extremely small size – Thousands times smaller than discrete circuits. It is because of fabrication of various circuit elements in a single chip of semiconductor material. Very small weight owing to miniaturised circuit. Very low cost because of simultaneous production of hundreds of similar circuits on a small semiconductor wafer. Owing to mass production of an IC costs as much as an individual...

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What are the limitations of integrated circuits?

The integrated circuits have few limitations also, as listed below: In an IC the various components are part of a small semi-conductor and the individual component or components cannot be removed, replaced, therefore, if any component in an IC fails, the whole IC has replaced by the new one.  Limited power rating as it is not possible to manufacture high power greater than 10 Watt) ICs. Need of connecting inductors and transformers exterior to the conductor chip as it is not possible to fabricate inductors and transform on...

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What is Schmitt trigger? How it works? Where is it used?

Schmitt trigger: Schmitt trigger is an electronic circuit with positive feedback which holds the output level till the input signal to the comparator is higher than the threshold. It converts a sinusoidal or any analog signal to digital signal. It exhibits hysteresis by which the output transition from high to low and low to high will occur at different thresholds. Invention: The Schmitt trigger was invented by American scientist Otto H....

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Why should Dry-Type Transformers never be overloaded?

Overloading of a transformer results in excessive temperature. This excessive temperature causes overheating which will result in rapid deterioration of the insulation and cause complete failure of the transformer coils...

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Can transformers be used in parallel?

  Figure: Transformers in Parallel Single phase transformers can be used in parallel only when their impedances and voltages are equal. If unequal voltages are used, a circulating current exists in the closed network between the two transformers, which will cause excess heating and result in a shorter life of the transformer. In addition, impedance values of each transformer must be within 7.5% of each other. For example: Transformer...

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Can Single Phase Transformers be used for Three Phase applications?

Yes. Three phase transformers are sometimes not readily available, whereas single phase transformers can generally be found in stock. Three single phase transformers can be used in delta connected primary and wye or delta connected secondary. They should never be connected wye primary to wye secondary, since this will result in unstable secondary voltage. The equivalent three phase capacity when properly connected of three single phase transformers is three times the nameplate rating of each single phase transformer.  For...

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State Possible Troubles in a DC Motor with Reasons.

Several troubles may arise in a d.c. motor and a few of them are discussed below: i) Failure to start: This may be due to- Ground fault                                                             Open or short-circuit fault  Wrong connections                                        ...

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What is an Autotransformer? Explain Autotransformer Operation. What are the Limitations, Advantages, Disadvantages and Applications of Autotransformer?

Autotransformer: An autotransformer (sometimes called autostep down transformer) is an electrical transformer with only one winding. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. The winding has at least three taps where electrical connections are made.  On load condition, a part of the load current is obtained directly from the supply and the remaining part is obtained...

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State the main effects of electric current? What are the applications of it?

The three main effects of an electric current are: Magnetic effect Chemical effect and Heating effect. Some practical applications of the effects of an electric current include: Magnetic effect:  When electric current flows through a wire, it behaves like a magnet. This is called magnetic effect of electric current. Figure 1: Electric bell - examples of magnetic effect. Applications of magnetic effect: Bells Relays Motors Generators Transformers Telephones Car-ignition...

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