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Victor21

Difference Between Power From PHCN And GENERATOR
~1.6 mins read
In a layman's term ......The power from PHCN is stable and with fixed frequency whereas the generator though may look stable, is not always delivering fixed frequency electricity supply.
What this means is that instead of your phone's battery to be charged on 240v 50Hz steadily when on PHCN, on generator it fluctuates between 200v/230v/240v 50Hz/45Hz/55Hz which may result in your battery not evenly charged. This is usually a resultant cause leading to mobile phone device/battery explosions.
Notwithstanding that PHCN sometimes deliver low voltage or fluctuating current, since it passes through the standard transformer it is well regulated to a steady frequency compared to
the generators AVR.
So, what this device does is to change from generator to public power supply and turn off the generator automatically when power is restored.â€
Capacity
“The device comes in different capacities — over 100 amps, 100 amps, and some below 100 amps capacity. The 100 amps device can conveniently be used in a two-bedroom flat with air conditioners. In industries, higher capacities are needed. There is also the 80 amps capacity automatic change-over for homes.â€
Durability
Said Emmanuel: “The change-over device is durable. There are imported change-over devices but they do not last. This locally made device is durable. I have made it for so many people and one of them who was using an imported one told me it lasted for only six months but the locally made ones last very long.â€
How it works
“If we want to install this automatic change-over device in a home, we remove the manual change-over and connect all the wires connected to the manual change-over to the terminal connector of the automatic change-over device. Then there will be a wire from the device down to the generator so when there is light, the automatic change-over device senses it with the help of a relay inside and when the relay senses that there is light, it will automatically trip off the generator and light comes on. There is no going to change over manually or to turn off the generator,†he said.
Components
“We have the leaves, contactors, transformers, indicator light, push buttons and wires all purchased from the local market.â€
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Victor21

Earthquake/Measurement
~1.4 mins read
Our Earth is made up of four layers, Crust, Mantle, outer core and inner core. The outer layer on which we stand is called crust. This outer layer isn’t made of one piece solid but it is made of several pieces called “platesâ€. These plates are connected together like a jigsaw puzzle.
Their joints are called fault lines. These plates are stuck together like the jigsaw puzzle but they have continuous movement with respect to each other.
The movement of plates against each other make earthquakes which happen constantly but we don’t feel their effect because they usually glide smoothly. It is estimated that fastest plate move with a speed of 6 inches per year or 15.2 cm/year.
When these plates catch each at some point then the pressure at that point builds up. When the pressure becomes very high then plates suddenly shift releasing very high energy waves that propagate in concentric circles shape and shake the nearby land that causes destruction.
Types of fault lines
Hypocenters and Epicenters
Starting place of an earthquake is known as hypocenter and it is below the surface of the Earth. A place directly above the hypocenter is called epicenter, where the strength of an earthquake is strongest.
Measuring Earthquake
Waves that are produced by an earthquake are called “Seismic wavesâ€. These waves are measured on the scale called†Richter scaleâ€. A seismograph is a device used to measure these waves. Larger the number on the scale, stronger the earthquake will be. Each increasing Richter number shows that earthquake is 30 times stronger than the previous number. An earthquake is noticed when its magnitude is 3 or more on the Richter scale, below this number you won’t notice any shake caused by an earthquake.
Seismograph
It is estimated that there are 500,000 earthquakes every year but only 100,000 are felt by people around the globe and only around 100 of them cause any damage.
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