A student is investigating how the length of a wire affects its resistance. The student connects different lengths of wire to a power supply of fixed voltage and measures the current in each length of wire. (a) The measurements taken by the student are shown in the table. Length of wire (m) 0-20 0-40 0-60 0-80 1-00 Current (A) 0-94 0-66 0-47 0-37 0-32 (1) Using the graph paper, draw a graph of these measurements. (Additional graph paper, if required, can be found on page 38) State whether the resistance of the wire increases, decreases or stays the same, as the length of wire increases. Justify your answer. Use your graph to predict the current in a 0-50 m length of wire, when connected to the power supply. Suggest one way in which the experimental procedure could be improved to give more reliable results.

A student is investigating how the length of a wire affects its resistance. The student connects different lengths of wire to a power supply of fixed voltage and measures the current in each length of wire. (a) The measurements taken by the student are shown in the table. Length of wire (m) 0-20 0-40 0-60 0-80 1-00 Current (A) 0-94 0-66 0-47 0-37 0-32 (1) Using the graph paper, draw a graph of these measurements. (Additional graph paper, if required, can be found on page 38) State whether the resistance of the wire increases, decreases or stays the same, as the length of wire increases. Justify your answer. Use your graph to predict the current in a 0-50 m length of wire, when connected to the power supply. Suggest one way in which the experimental procedure could be improved to give more reliable results.