Aluminium has a resistivity of 2.65 10-8 m. 1) The resistance of a piece of metal is directly proportional to the length and inversely proportional to the cross-sectional area. Explain how this can be understood from knowledge of the total resistance for resistors in series and parallel. 2) What is the resistance of an aluminium wire of length 1.3 km and cross-sectional area 1.13 10 m when measured from end to end along the length? 3) What is the electrical current flowing along this wire when a voltage of 6 V is connected between the two ends?