Topic 2 - Revision Questions... Graphs and Diagrams

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Thermistor Graph

(http://physics.taskermilward.org.uk/KS4/additional/electricity/thermistors_and_ldrs/thermistor_graph.png)

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Thermistor Graph Annotations

Annotate how the resistance of a thermistor changes with the change of temperature.

As the Temperature increases, the Resistance is lower.

As the Resistance increases, the Temperature is lower.

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Light Dependant Resistor (LDR) Graph

(http://physics.taskermilward.org.uk/KS4/additional/electricity/thermistors_and_ldrs/ldr_graph.png)

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Light Dependant Resistor Annotations

Annotate how the resistance of a Light Dependant Resistor (LDR) changes with light intensity

The Higher the light intensity, the lower the Resistance.

The Lower the light intensity, the higher the Resistance.

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Metalic Structure

Draw a Metalic Structure... Why does resistance increase with temperature for metals?

(http://www.chem.qmul.ac.uk/surfaces/scc/images/scat1_4d.gif)

Atoms vibrate as the temperature rises. Collisions with Electrons are more likely to happen.

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Filament Lamps Graph

(http://www.bbc.co.uk/staticarchive/2453c6b9be954f055256d4a8f6315f29cc169f87.gif)

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Filament Lamps Annotations

Annotate how current varies with potential difference filament lamps.

The Resistance of a filament lamp increases as the Temperature of its filament increases.

The Current flowing through a filament lamp is not directly proportional to the voltage across it.

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Diodes Graph

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Diode Annotations

Annotate how current varies with potential difference diodes.

The Diode has a Very High Resistance in one direction.

This means that the Current can only flow in the other direction.

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Fixed Resistors Graph

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Fixed Resistors Annotations

Annotate how current varies with potential difference for fixed resistors.

The Current flowing through a Resistor at a constant temperature is directly proportional to the Potential Difference (Voltage) across it.

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