Observation

• Plot a graph using reasonable scales
• Draw line of best it
• Determine the slope and intercept of the graph
• State any two of the following precautions.                          

e.g.

• Ensured key is disconnected/removed when not in use
• Ensured terminals are clean
• Ensured terminals are tight
• Avoided parallax error on voltmeter
• Noted/corrected zero error on voltmeter
• Repeated readings stated

b(i)      Factors Affecting the Resistance of a Wire

      e.g.

• Temperature
• Length
• Cross sectional area/thickness/diameter/radius
• Nature of material/resistivity