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AQA

3.5 Electricity

This part of the course has many opportunities for setting up practical circuits as well as learning about new types of circuits including potential dividers.

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Learning Checklist

3.5.1 Current Electricity

Current and Charge

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Charged particle movement

Circuit Symbols

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Essential for circuit diagrams

Resistance

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Voltage to current ratio

Resistivity

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A bulk material property

Electrical Power

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2

Rate of energy transfer

Circuits

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How components behave together

Internal Resistance

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From EMF sources

Conductors

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These allow the movement of charges

Voltage

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Potential difference or EMF

IV Characteristics

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Common component behaviour

LDR's and Thermistors

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Semiconductors with variable resistance

Kilowatt Hours

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A large unit of energy

Potential Dividers

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Dividing potential difference

The Wheatstone Bridge

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A simple bridging circuit​

Practical Experiments

Practical - Resistivity

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Measuring resitivity if a metal

Practical - Internal Resistance

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Measuring the EMF and resistance of a cell

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