Review Read the comments I have written in your book.

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Review Read the comments I have written in your book. Complete your next steps in PURPLE PEN. Correct any Spelling and Grammar mistakes in PURPLE PEN.

Engage On your whiteboard, explain what current, voltage and resistance are. Use a diagram to support your explanation.

Investigating Resistance All core practical's should be completed in the back of your exercise books 01/12/2018 c/w CORE PRACTICAL 5 Investigating Resistance P2.6

Specification Points

Investigate the relationship between Current and Voltage for a fixed resistor Connect up the circuit as shown Increase the voltage on the power pack 2V at a time. Record the current and voltage in a table. Calculate the resistance by doing R = V/I Voltage (V) Current (A) Resistance 2 4 6 8 10 12

Plot a graph of your results Explain Plot a graph of your results current Go up in 0.01s or 0.02s voltage Go up in 2s

Current-Voltage graph for a fixed resistor Explain Current-Voltage graph for a fixed resistor Voltage (V) Current (A) 2 0.02 4 0.04 6 0.06 8 0.08 10 0.10 12 0.12

The current-voltage graph for a fixed resistor is a straight line, showing the resistance stays the same The steepness of the graph tells us about the resistance: Steeper = low resistance Flatter = high resistance Key Notes

Investigate the relationship between Current and Voltage for a lamp Connect up the circuit as shown Increase the voltage on the power pack 2V at a time. Record the current and voltage in a table. Calculate the resistance by doing R = V/I Voltage (V) Current (A) Resistance 2 4 6 8 10 12

Key Notes For a light bulb the graph gets flatter with more voltage. This means there is more resistance. This happens because the bulb gets hotter. Key Notes

Key Notes A diode only lets current flow in one direction. It has a very high resistance in the other direction, which stops the current flowing. For a light bulb the graph gets flatter with more voltage. This means there is more resistance. This happens because the bulb gets hotter. Key Notes

Extend Describe each of these graphs… What happens to the steepness (resistance)?

In your own words explain the use of Extend In your own words explain the use of LDRs and Thermistors What affects there resistance? How does their resistance change (what shape graph)? How might they be used to control other components in a circuit?

Key Notes LIGHT DEPENDENT RESISTORS The resistance decreases as the light intensity increases. THERMISTOR The resistance decreases as the temperature increases. Remember, the resistance will affect how much current flows in the rest of the circuit Key Notes