ELECTROMAGNETS

Electromagnets can be made by passing an electric current through an insulated copper wire wrapped on a soft iron piece.



(Use DC current source such as batteries for preparation of electromagnets and also make sure wire used for wrapping is insulated)

The strength of electromagnets depends on

  • the number of turns of the coiled conductor
  • the strength of the current
  • the area of cross-section of the soft iron piece 

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COLLOID

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  In colloidal solutions particles are uniformly spread throughout. Due to small size of particles, colloids appears to be a homogeneous mixture but it is a heterogeneous mixture. A colloid contains a dispersion phase and a dispersion medium. Dispersed particles in colloid is known as dispersion phase and component in which dispersion phase is suspended is known as dispersion medium. Colloids are classified based on difference in state of dispersion medium and dispersion phase. Type of colloids with examples is provided in the below table, Examples of colloids  Milk, jelly, shavings cream, smoke, foam, mud etc Properties of a colloid Colloid is a heterogeneous mixture  Particles of colloid is small, cannot be seen with naked eyes  Particle size of colloids are big enough compared to pure solution to scatter a beam of light, so that we can observe Tyndall effect. ( The phenomenon in which path of a light is visible when a beam of light passed through some colloids is ...
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ACCELERATION

 Acceleration is defined as rate of change of Velocity.  Ie, acceleration = change in Velocity/time Consider a body moving with an initial velocoty(u) reaches a final Velocity (v) in time (t). Hence velocity is charged from u to v at time t  body is accelerating. Acceleration ( a ) = change in Velocity/ time a = v - u/t Unit of acceleration is m/s² There are two types of acceleration  1. Positive acceleration  If the Velocity of a body is increasing with respect to time(body is increasing the speed) then the acceleration is considered to be Positive.  2. Negative acceleration (retardation) If the Velocity of a body is decreasing with respect to time ( body is reducing the speed), then the acceleration is considered to be negative.  It's also called as retardation. 
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HOUSEHOLD ELECTRIC CONNECTIONS

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 House hold electric circuit The pictorial representation of household electric circuit is given in the below diagram. Tree system  Generally, for the household connection two lines are taken from the distribution system as shown in the diagram. Starting from the left hand side of the diagram, one red and one black line connection is provided to a house, red line represent live line or phase line and the black line represent neutral line. Initially they are connected to watt hour meter which is used to measure the current used in that particular house for billing purposes. From there earthing should be done, which is shown in the diagram in green colour. Colour code of household electric wires and potentials difference between them As we mentioned above there are three lines in household electrical circuit-  live line(phase line), neutral and earth line. For live which is also known as phase line we have to use red coloured wire. For neutral line, black wire is used. And ...
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This blog contents are specifically for high school students all over the world . Those who are preparing for GCSE physics and GCSE chemistry have lot of topic to refer from this blog. PHYSICS   CHEMISTRY   SCIENCE IN DAILY LIFE  SCIENCE EXHIBITION PROJECTS 
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