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What is the equation for potential difference?
Potential difference (V) = Current (A) x Resistance (Ω)
What is the ammeter?
measures the current flowing through the test wire
What is the voltmeter?
measures the potential difference across the test wire
In what circuit do you use an ammeter in?
A series circuit
In what circuit do you use a voltmeter in?
A parallel circuit
Explain the practical to investigate the affect of wire length on resistance
Attach a crocodile clip to the wire with 0 cm on the ruler
Attach a second crocodile clip to the wire and write down the length between the 2 clips
Close the switch then record the current through the wire and the potential difference across it
Open the switch then move the second crocodile clip further along the wire and close the switch again
Repeat this for a number of different lengths of test wire
Use your measurements to calculate the resistance for each length of wire
What factors affect resistance?
whether components are in a series or parallel circuit
the length of the wire
What should the graph to represent the effect of wire length on resistance look like?
X-axis: length of wire
Y-axis: resistance
Line of best fit: straight and directly proportional starting at 0, or the origin
Note 
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