# 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.

- Created by: Oliver Barrs
- Created on: 14-05-09 14:54

First 193 words of the document:

Physics

Current, Potential Difference and Resistance

Current

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 still...it'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

pipe.

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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