# aqa physics circuits

PLEASE NOTE THIS I A BAISIC MINDMAP AND IS NOT ALL YOU NEED TO KNOW ABOUT CIRCUITS

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- Created by: ALICIA SMITH
- Created on: 14-04-13 10:35

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- CIRCUITS
- Current and potential difference
- current is the flow of electric charge round a circuit
- current will only flow through a component if there is a potential difference across it
- potential difference is the driving force pushes the current around (in VOLTS)
- the greater the resistance across a component the smaller the current that flows
- CURRENT = CHARGE / TIME
- P.D = WORK DONE / CHARGE
- CURRENT x RESISTANCE

- THE BASICS
- the ammeter
- measures current in AMPS
- must be placed in a series
- can never be parallel to the volmeter

- the volmeter
- measures potential difference in VOLTS
- must be placed in parallel around the component not the variable resistor or the battery

- very basic circuits are used for V-I graphs
- as you vary the variable resistor it alters the current flowing through a circuit

- the ammeter
- GRAPHS
- the current through the resistor is directly proportional to the P.D
- as the temperature of the filament increases the resistance increases
- RESISTANCE ALWAYS INCREASES WITH TEMPRATURE

- current will only flow through a diode in one direction. It has a very high resistance in the opposite direction

- SERIES CIRCUITS
- P.D. is shared between the components
- current is the same everywhere
- total resistance is the resistance added up throughout the whole circuit
- cell voltages are added up

- PARALLEL CIRCUITS
- P.D, is the same across all components
- current is shared between the branches

- Current and potential difference

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