Indepth Electrical engineering

Electric Shock: Causes, Effects, and First Aid Steps You Must Know Learn what happens during an electric shock, its severe effects on the human body, and essential first-aid steps like CPR and injury management to save lives. Introduction Almost everyone has experienced a mild electric shock at some point in life. An electric shock occurs when electric current flows through the human body. Since the body is composed of about 60–70% water , and water is a good conductor of electricity, our body also acts as a conductor. While small shocks may only cause discomfort, severe electric shocks can be life-threatening , leading to burns, heart problems, organ damage, or even death. This article explains the effects of electric shock and the immediate steps to take as first aid to save lives.                                                   Effects of Electric S...

Resistance is only component availbale which converts current into voltage and voltage into current. Resistance in Series:- In Series resistance are additive and are as described below:- If there are resistances are R1, R2, R3, R4 ----- RN are connected in Series then equivalent resistance is given as  R (Eq.)= R1 + R2+ R3+ R4+ ---------------------+RN Series resistance is known as voltage divider circuit in which voltage get divided but current remains the same. Whenever resistance is added in series then equivalent resistance is getting increased. To know about capacitors in Series and Parallel Visit:- http://electrialstandards.blogspot.in/2015/05/capacitor-in-series-and-parallel.html Resistance in Parallel:- If there are resistances are connected in Parallel then equivalent resistance is given as :- If there are resistances are R1, R2, R3, R4 ----- RN are connected in Series then equivalent resistance is given as  ...

Lighting emitting diodes mostly known as LEDs are now becoming integrated part of every Industry, Household , Shops and everywhere as they offer plenty of advantages some of them main are such as power saving and long life. There is curiosity arises how these LED’s will work? Working principle of the same is as below:- LED is capable of emitting a fairly narrow bandwidth of visible or invisible lights and LED emits lights usually of orange, red, yellow, or green colors. The invisible light that LED emits includes the infrared light. LED consists of a P-N junction diode. When electric current is applied to that P-N junction then that junction emits light .This sensation is generally called Electro-luminance in electronics. Electro-Luminance is defined as the emission of light from a semi-conductor under the influence of an electric field. At PN junction there are electrons at N- Region and Holes in P- region. These combine at PN Junction. Free electrons a...

There is quite confusing question most of the time asked in interview is that if there are three bulbs having ratings as 60W, 30W and 20W and these bulbs are connected in parallel then which of these bulb will be brightest?? Answer to that question is that in Parallel   1               =  1  + 1  +   1 R(eq)             R1   R2    R3 Multiply both sides by Rated voltage square i.e. (V Rated ) 2 We get (V Rated ) 2    = (V Rated ) 2 + (V Rated ) 2   + (V Rated ) 2 R(eq)              R1                R2               R3 This means P(eq)= (P1)+...

LED vs CFL vs Incandescent Lights: Which is Better for You? When it comes to choosing lighting solutions for homes or offices, the three most common options are: Incandescent bulbs (traditional yellow bulbs), Compact Fluorescent Lamps (CFLs) , and Light Emitting Diodes (LEDs) . Each has its own advantages and disadvantages, but LEDs have emerged as the most energy-efficient and sustainable choice. Let’s break down the comparison. 1. Lifespan Comparison Incandescent Bulbs: ~1,200 hours CFLs: ~8,000 hours LEDs: ~50,000 hours 👉 Clearly, LEDs last up to 40 times longer than incandescent bulbs and more than 6 times longer than CFLs , which means fewer replacements and reduced waste. 2. Energy Efficiency (Power Consumption vs Lumens Output) LEDs produce the same amount of light (lumens) with much lower wattage. Lumens (Brightness) LED (Watts) Incandescent (Watts) CFL (Watts) 450 (≈ ...

Generator connected to Isolated load:- When the prime mover I/p is increased while the excitation remains constant; it results in an increase in frequency. The increase in frequency increases the terminal voltage for the same excitation. The increase in  terminal voltage causes the static load to increase their respective demands as their power consumption is proportional to square of the voltage. The rotating load have their respective speed increases because of the increase in frequency that increases their synchronous speed. The increase in voltage results to increase in their developed torque and consequently the power demand may increase particularly when they are driving constant torque load. The twin factors results in as increased power demand by the rotating power load as well. The final conclusion is that an increase in prime mover I/P alone results in increase in frequency as well as increase in Unit loading. If the excitation increases w...

Regenerative Braking in Induction Motors Braking of induction motors is essential for controlling speed, safety, and energy efficiency in industrial drives. Among the various braking techniques, regenerative braking is highly efficient since it converts the motor’s kinetic energy into electrical energy and feeds it back into the supply system. Principle of Regenerative Braking In a normal stator-fed induction motor , regenerative braking is possible if the number of poles of the machine can be changed during running conditions using special arrangements. This technique is applicable in squirrel cage induction motors since: Number of poles in the stator = Number of poles in the rotor (though not necessarily equal to the number of phases). Method of Operation Pole Changing Method When braking is required, the number of poles is increased (usually by a factor of 2). The synchronous speed of the revolving magnetic field reduces to half. Slip becomes nega...