• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Science + Chemistry revision + Electrostatics

Extracts from this document...


Science – Revision notes (ELECTROSTATICS)

Electrostatics is the study of electrically charged objects.

Insulators can be charged by friction.Conductors can be charged by making contact with another charged object or through induction.

Only Insulators can hold on to static charges. In conductors the charge leak away.

A charged object can induce charges on nearby objects.

Unit of Charge is the Coulomb

Charges of friction are very small so we work in smaller units.





The smallest quantity of charge is on an electron. The proton and electron have equal charges but of opposite signs.

Conservation of Charge

Charge cannot be created or destroyed. It can only be moved from one object to another. When two charged objects are brought together electrons will flow from where there are too many to where there are too few. The charge is distributed over both objects and when they are separated they will have equal charges.(when objects have same shape and surface area)

...read more.


Field lines never cross, their direcetion is from positive to negative.They always begin and end at right angles to a surface.

When a charged object is moved into an electric field it gains electrical gravitational energy equal to the amount of work done to  move it. When the charged object is released it will change from electrical potential energy to kinetic energy.

Potential difference

Potential difference between two points is the work done to move 1 coulomb between the points.

V=potential difference

W=work or energy



Electrons flow from points of low potential to points of high potential. They flow up the potential gradient.

Positive charges flow down the potential gradient.


A simple capacitor consists of two parallel metal plates separated by an insulating material

This insulating material is called a dielectric

Capacitor stores charge.

Used to prevent the flow of direct currents.

Storing memory on a computer and in a camera flash.

...read more.


Electromagnets only work when there is current flowing because soft iron does not retain its magnetism.

Electromagnetic induction

The process of producing the EMF and the current is called electromagnetic induction.

The faster we move the magnetic through the coil the faster the EMF and the larger the current.

The moil coils, the faster the emf and more current

Faradays law.

The emf induced in a coil increases with the rate of change of flux linkage..

The more field lines that are cut per second the larger the emf and induced current.

Induced current is cuurent that is created when a magnet is moved in and out of a solenoid.

Magnetic flux is total number of field lines passing through an area. Calculated by times magnetic field strength by area through which flux passes.

Change of flux linkage is change in number of field lines passing across a conductor.

Rate of change in flux linkage is the rate in which lines are cut.  

...read more.

This student written piece of work is one of many that can be found in our GCSE Organic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Organic Chemistry essays

  1. Conductors and Insulators.

    You can see that the field is perpendicular to the wire and that the field's direction depends on which direction the current is flowing in the wire. The compass needle aligns itself with this field (perpendicular to the wire). These fields can be made stronger by increasing the amount of

  2. Electromagnetism - investigating what effect increasing the number of turns in a coil on ...

    I will use 3A; I found this from my pretest results. * I will try to keep the coil of wire at the same temperature throughout, as I do not want the wire to burn and melt its plastic coating, as this is dangerous.

  1. Investigation on Photovoltaic Cells

    So this supports my conclusion. The voltage increases but the readings are slightly lower, the reason this could be is because Sarah had her lamp 16cm away from the solar cell whereas I had mine 15cm away from the solar cell.

  2. Physics Revision

    if there is a break in the circuit, charge stops flowing * * A = V/R * The potential difference of the supply is shared between all the components in the circuit. Parallel Circuits * For components in parallel: o The potential difference is the same across each component o

  1. Energy revision notes

    Meaning whatever the forms of energy involved, total energy output = total energy input. Total energy input = useful energy output + wasted energy output The efficiency of a device is the fraction of the energy supplied to the device, which is usefully transferred.

  2. Testing the strength of electromagnets

    attach to either side of an ammeter and then using two more connector wires you attach them from the ammeter to the negative and the positive terminals of the power pack connect the power pack to the mains and switch it on at the plug socket.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work