Sai Science academy

  Distance  is the path covered by the body Distance is a scalar quantity It is dependent on path followed by object Displacement  is the shortest distance covered by the body It is a vector quantity It is independent on the path followed by the object Displacement is defined as the change in position of an object ∆x = X initial — X final ∆x = Xi — Xf # When final position is equal to the initial position we say displacement is zero Distance ≥ Displacement  Created and edited by Sai Group Sai Group  In case of any doubt frankly ask in comments, I will try to answer Viewer's now you can also ask questions and also answer questions, follow Sai Group Happy learning Thank you

Electron flow vs. Conventional Current    In 1752, prior to electricity being identified with the electron, Ben Franklin chose a convention regarding the direction of current flow. Franklin assumed that positive charge carriers flowed from positive to negative terminals. We now know this is incorrect. In metals, the charge carrier is the electron whose charge is negative by definition (note negative sign): (−1.6 × 10−19 C)   The flow of electrons is termed electron current. Electrons flow from the negative terminal to the positive. Conventional current or simply current, behaves as if positive charge carriers cause current f low. Conventional current flows from the positive terminal to the negative. Perhaps the clearest waytothinkaboutthis is to pretend as if movement of positive charge carriers constituted current flow.    It is important to realize that the difference between conventional current flow and electron flow in no way effects any real-world behavior...

 Current is the flow of electrons  SI unit - Amperes (A)  Other units - mA - Milli Amperes  1A= 1000mA 1mA = 1/1000A Electric current (I) = V/R  Electric current= Charge / Time  Electrons are negatively charged they flow from the negative terminal to the positive terminal  But  Conventional current or electric current flows from positive to negative  This is the opposite flow get more about here

 Ohm's Law is used to calculate the relationship between voltage, current and resistance in an electric circuit. Ohm's Law - V= I×R V- Voltage (unit of potential difference) I- Electric current R- Resistance  -> V= IR  -> I=V/R  -> R=V/I  ✓ Resistance  Resistance is the restriction to the flow of electrons    SI unit- Ohm Ω  R=V/I  -> Size  More length - More resistance Less length - Less resistance -> Thickness  Thin - More resistance Thick - Less resistance -> Material  Copper - Less resistance Aluminum - More resistance -> Temperature More temperature - More resistance Less temperature - less resistance 

 2. FRICTION 1. Friction is the force which opposes the relative motion between the two Surfaces in contact and it acts on both the surfaces. 2. Friction depends on the nature of surfaces in contact. 3. Friction is independent of the area of contact. 4. Friction is caused by irregularities on the two surface in contact. 5. 6. Static Friction comes into play to counter balance the applied force on the body. When one surface is sliding over the other sliding friction comes into play. 7. When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction. 8. The sliding friction is slightly less than the static friction. 9. The frictional force exerted by fluid is called drag. 10. Friction can be reduced by using:- grease oil, powder, ball bearing and using anti friction alloy. 11. The substance which reduce friction are called lubricants. 12. Rolling friction is smaller than the sliding friction. 13. The sole of the shoes and the tyres of...

# Speed= Distance/ Time  # Time = Distance/ Speed  # Km/hr to m/s conversion:    X Km/hr = (x × 5/18) m/s  # m/s to km/hr conversion:     X m/s = (x × 18/5) km/hr  # If the ratio of the speeds of A and B is a : b, then the ratio of the time taken by them to cover the same distance is 1/a : 1/b or b : a  # Suppose a man covers a certain distance at x km/hr and an equal distance at y km/hr. Then,the average speed during the whole journey is   (2xy/x+y) km/hr Thank you  Regards SSA Sai Group

 Q1) What is a pixel? Ans- Pixel is a small dots or squares that make up a image or a screen Many pixels make a screen, every screen has many pixels. Q2) What is HLA typing Ans- HLA typing is a kind of genetic test used to identify certain individual variations in a person's immune system.  This is especially used to find out the type of blood, it is important to know HLA typing, in case of any blood transplant, this is used.  Every people have different HLA typing, so the person with same HLA typing can donate the blood to the person with same HLA typing. So I hope you understand, if you want more information and details on it then tell me in comment's. Q3) What is the purest form of sound? Ans- Beejakshara We hear many different type of sounds, but purest form of sound in beejakshara. Beejakshara is written in hindu texts as OM, shreem, hreem..... Etc. These sounds when you spell then some vibrations starts inside and you start to go into some super meditation.  No...

 Q1) What is a Black hole Ans- A Black is a region of space time where gravity is intense  Q2) How is a Black hole formed  Ans- a Black hole is formed when a massive star explodes, this process is called supernova, in this way a Black hole is formed. Did you know! Our can't form a Black hole because it is not too massive, thus when Sun explodes it is not called as supernova Q3) Where are the black holes present? Ans- The supermassive Black hole lie at the center of the Galaxies. Did you know! The name of the black hole present at center of MILKY WAY GALAXY is SAGITTARIUS A  Q4) Why black holes so intense Gravity  Ans- The gravity is so strong because matter has been squeezed into a tiny space. Did you know! The gravity in black holes are so strong that even light can escape. Hi viewers This is SSA from Learn it, Sai group, I try to spread information through my blogs and websites. Our motto of this group is Information should be free. I will reach u with a lot ...

 Welcome to SSA From learn it  Charge - Charge is the property of matter that produces ans experiences electrical and magnetic effects   Point charge:- when linear size of charged body is much smaller than the distance under consideration, the size may be ignored and the charges body is called point charge.  Electrification - The process of giving charge to a body is called electrification. Methods of electrification  a) Charging by friction Two glass rods rubbed with silk or wool cloth are brought close to each other, they repel each other  The two strands of wool or two pieces of silk cloth, with which rods were rubbed, also repel each other. However, the glass rod and wool attracted each other. Similarly, two plastic rods rubbed with cat's fur repelled each other but attracted the fur. On the other hand, the plastic rod attracts the glass rod and repel the silk or wool with which the glass rod is rubbed. The glass rod repels the fur. In this process whe...

 Q1) Light   a ray or a wave or a particle Ans- In first of classes light is taught to us as a ray and it travels in a straight line  But then after in further classes its told light is a wave   Then again in higher classes it is told light is a particle Now we will get confused that is light a ray or a wave or a particle  Light is a particle called photon,  It is also a electromagnetic wave, a transverse wave Q2) How light travels in higest speed? Ans- Light is made of a particle called photon. Photon  is a massless particle, that means it has no mass, now we know that if a particle has no mass then there will be no resistance force (i.e. Friction, gravity) nothing will stop this Photon, so that's the reason light travels very fast. Hi viewers This is SSA from Learn it, Sai group, I try to spread information through my blogs and websites. Our motto of this group is Information should be free. I will reach u with a lot of topics covered. Visit my...