Ohmic Resistor Current-Potential Difference Graph

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Presentation transcript:

Ohmic Resistor Current-Potential Difference Graph Describe the relationship shown on the graph. “As **** increases, ####...” Describe what negative voltage or current mean on the graph. Diagram of a simple circuit

Non-Ohmic Resistor – LED Current-Potential Difference Graph For a diode What does LED stand for? Describe how the resistance on the graph changes as you change the voltage and current from positive to negative. Diagram of a simple circuit containing a diode. Add arrows showing the direction of positive current and negative current.

Non-Ohmic Resistor – LDR What does LDR stand for? How can you change the resistance of an LDR? When is it at it’s lowest resistance? Resistance graph for an LDR Diagram of a simple circuit containing an LDR with low resistance. How might we use an LDR? Where could it be useful? (include a picture)

Non-Ohmic Resistor – Thermistor What is a thermistor? How can you change the resistance of an thermistor? When is it at it’s lowest resistance? Resistance graph for an Thermistor Diagram of a simple circuit containing an Thermistor with high resistance. How might we use a thermistor in the kitchen? (include a picture)

Become an electrical engineer… Easy Design a device that uses a LED or LDR or Thermistor. Explain how your device is useful. Medium Design a device that uses any two of; LED, LDR, Thermistor. Explain how your device works. Hard Design a device that includes a LED, LDR and a thermistor. Explain how your device works and what would happen if the battery was inserted the wrong way round.