what the fuse actually protect.

Consider the following simple circuit:

There are basically five components in the above circuit i.e 9 V battery, Fuse, Switch, Lamp and the connecting wire.

Which component is fuse protecting in the circuit ?

If you think that it is the lamp load then you are incorrect. It is actually the wires that fuse protects because it is the one that is actually carrying the current whereas lamp is drawing the current supplied by the battery source. Thus the primary function is to protect the wire though it will at the same time avoid damages to the load due to overcurrent.

#AAYUSH BHARDWAJ

The zero Watt bulb, Nothing is ZERO.

It is called as zero watt but actually it is not. it is. These small Incandescent bulb have power rating of 10 to 15W.

In the earlier day electro mechanical energy meters are used instead of digital meters to record the energy consumption.

Electrical consumption was recorded by counting revolution of a disc through mechanical counters and for this a minimum current is required to be flowed through the meter. Now the current drawn by these bulb is very small to grt the disc rotating and hence the energy consumption is not recorded by these electro mechanical energy meter.

Hence it seems that bulb have no power consumption and hence they got the name zero watt bulb.

Now with the digital meters even a small current drawn by 0.1V LED is also detected and hence the zero watt bulb is a misnomer

#AAYUSH BHARDWAJ

Latest technology in mechanical engineering

Tesla electric car

Most of the electric vehicles failed because of poor design structure, safety feature, charging infrastructure, etc. They worked splendidly on every failure of their rival forerunners. Tesla models are not hybrid, they are fully electric.

Fuel cell cars - The Mirai

Self driving Car

Google’s self driving car is almost driverless(manual assist needs in some dangerous turns) with start and stop option and which uses chauffeur system. The LIDAR(combined SONAR and RADAR) technology with Google map works in a precision manner. It uses 64 typical laser beams to find the objects around the car (360 degree). Cost of this system is around US $ 1 lakh. Accuracy, precision is more in this system which enables pre safe. Top speed is 40 kmph.

Honda Self balancing Motorcycle

Honda revealed a motorcycle that can run without being controlled by the driver and balanced by itself without fall in Consumer Electronic show(CES), Las vegas.

The new technology was developed by Honda to eradicate low-speed accidents. The motorcycle will even follow its rider when the rider is not sitting on the motorcycle.

The digital system that senses the low-speed below 3 miles per hour, disengages the handlebar from the front forks and computer takes it to control.Generally, the self-balancing technology uses gyroscopes but they add a lot of weight. Instead, Honda's Riding Assist system increases the rake angle the front forks and disconnects the handle bar. it then uses minute steering inputs to keep the bike perfectly balanced.

It reduces the center of gravity to improve the stability to withstand without falling.

It's following the rider by the sensing technology.if you want to get parking the vehicle go to the place where you want to park.

Hope it will reduce the accident and improve the rider safety.

Netherlands-based PAL-V Europe NV has bagged a patent in India a two-seat hybrid car and gyroplane Back to the future: flying car in India

Those who were amused by the flying car that knocked at the window of Harry Potter, can now look forward to a real flying car knocking at their door in the future.

The Netherlands-based PAL-V Europe NV has bagged a patent in India for the Personal Land and Air Vehicle (PAL-V), a flying car that can also run on roads. The car made its successful maiden flight in The Netherlands in 2012 and the company has been developing PAL-V One, a two-seat hybrid car and gyroplane with the convenience of fully integrated door-to-door transportation.

#AAYUSH BHARDWAJ

How exactly the electric line tester works.

What here I am going to write is very basic but interesting.

Every common man (who uses electricity) knows what is the Tester & how to use it.

But most of the people don’t know how exactly it works?

When we touch mouth (flat end of the Metallic rod) of Phase or Line tester with naked Live / hot wire whereas one of our finger touch the metallic Cap Screw or Clip of Phase/Line Tester  then circuit is completed and current start to flow in Metallic rod.

Metallic rod is connected to the resistor which reduces high current to a safe value. The reduced Current passes through Neon bulb which is connected to (metallic spring) . Metallic spring is connected with metallic Cap screw which is in contact of our fingers. A very small current passes through our body to earth and complete the circuit. When circuit is completed, current starts to flow and the filament of neon bulb starts glowing. One thing which is important here is that the neon lamp takes very little current to light, and thus can use the user's body impedence to earth ground to complete the circuit.This indicates that the touched wire with Phase/Line Tester mouth is Phase/Line/Hot.

If we perform the same action as mentioned above, and Neon bulb does not glow, it means that is a Neutral Wire/Conductor and Neon bulb does not glow, it means that  it is a neutral wire/ conductor.

These types of currents, which does not cause any harm to our body are called as “let go currents”. (For women, it is typically 5 to 7 milliamperes, and for men, typically 7 to 9 milliamperes. This is dependent on the muscle mass of the individual.)

.

Try doing this:

1.     Stand on plastic/wooden chair.

2.     Insert tester in socket, with one of your fingers touching end of tester.

3.     Switch ON the supply.

If you follow above steps you will find, light inside tester illuminates but intensity is quite low. Because additional resistance gets added in circuit.

That’s all!

#AAYUSH BHARDWAJ

Electric Shock

1.Touch any one terminal of a battery, and you won't experience any electric shock.

1.Touch any one terminal of a battery, and you won't experience any electric shock.

Why does this happen?

An electric current needs a closed path to travel.

·        When you touch only one terminal of a battery, current has no path to travel back to the battery and hence you are safe as no current would flow through your body.

·        Now, if you touch any one terminal of a socket outlet, a current equal to 230V/(~1700 Ohm*) will flow through your body. *- resistance of human body is roughly around 1700 Ohm.

This is because, the neutral(N) terminal of the transformer which feeds power to your house is grounded, i.e. earthed(one of its terminals is immersed into earth/ground). When you touch any one terminal of the socket, current travels through your body to earth, and through earth back to the transformer neutral terminal which is immersed into earth. This completes the circuit and offers a path for the current to flow. So, it shakes you off with a shock! A battery is never earthed, and hence this does not happen in case of a battery.

#AAYUSH BHARDWAJ

The difference between 'k' and 'K' while mentioning units of data.

The difference between 'k' and 'K' while mentioning units of data or throughput.

k stands for kilo expressed in powers of 10, i.e., k means 1000
K stands for kilo expressed in powers of 2, i.e., K means 1024

So, 2 kb/s means 2*1000 = 2000 bits per second where as
2 Kb/s means 2*1024 = 2048 bits per second.



thats it.


#AAYUSH BHARDWAJ

Stroboscopic Effect.

There is a specific reason for usage of Incandescent Bulbs in industries, rather than Fluorescent.

When the light of specific frequency emitted from CFL bulbs falls on rotating machine’s blade  ,they become slower or sometimes reflects  its rotation in reverse
This is called stroboscopic effect.

Here are some examples

This might lead to accidents sometimes.

Hence Incandescent bulbs are used  in industries to prevent 

#AAYUSH BHARDWAJ

Ever wondered why a bird sitting  on an electrical transmission line doesn't experience shock?

I know that this concept is taught in school level but this is for those who forgot it.

​It is because, the movement of electrons, that is, current, is the ultimate thing which causes shock. It is the electric current that burns tissue and freezes muscles. Here, the current doesn't pass through the bird.

To know why, you have to understand these things:

1. Electric current flows through the path only when there is a potential difference between the starting and ending points of the path. Electric current doesn't occur by itself. We need voltage (potential difference) across a path. It is just similar to two buckets of water connected by a small pipe. The flow of water is similar to the flow of electrons, that is, current. It requires a difference in potential for the flow.

​​2. Electric current flows only when there is a closed path. But here is a closed path. It's bird's left leg, bird's body,bird's right leg and the wire makes it a closed path.

3. How to calculate the voltage drop? The formula for the voltage drop is V=IR. where, i is the current and R is the resistance of the conductor. Generally, the resistance of the transmission line between bird's legs is very negligible. Very close to zero. So, if the voltage at bird's left leg is 11,000 volts, then the voltage at bird's right leg is also 11,000 volts as there is no voltage drop in  pass through the bird.

 So, the potential difference V across the bird's legs is nearly equal to 0 (11,000-11,000), which makes  the current not to pass through the bird.

#AAYUSH BHARDWAJ