Current, Potential Difference and Resistance.

A Good break down of the first part of Unit 1's Electricity and Circuits.

Complete with Formulas and a Graph diagram.

Try to understand it, I don't think I quite worded some bits right.

Thanks to the CGP AQA AS-Level Physics Revision Guide for revision help and good Analogies for certain parts.

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Current, Potential Difference and Resistance
Current is the Rate of Flow of Charge!
Current can be represented
by this equation:
This equation should be included in the test paper.
But even's pretty obvious and simple.
If you haven't already guessed, the Coulomb is the Unit for Charge.
You may need to know the definition for the exam.
The best way to think of Current in a wire is as Water Flowing in a pipe. The Amount of
water that Flows past a point during a certain amount of time, this is influenced on the
Pressure pushed on the water.
Potential Difference (P.D)
Potential Difference is the Energy per Unit Charge!
Potential Difference can be seen as the Pressure that is pushed on the water in the
Potential Difference (P.D.), or Voltage, is Defined as the Energy converted per unit
Charge moved.
This most likely will be on the Data Sheet included in the exam.
Just remember how and when to use it.

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Everything has Resistance...eventually...!
If you put a P.D across an Electrical Component, a Current will flow.
The amount of Current given from a particular P.D depends on the resistance of the
There are Many conditions that influence the resistance of a Component. Here are
Temperature of the component. Colder Temperature gives better Resistance.
Length of the component. Longer component gives more resistance.
Cross sectional area of the component. Bigger area gives less resistance.…read more


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