Test Yourself on Tutorial 1 Why might a good electrical conductor also be a good thermal conductor? Comment on a variety of sources of electricity as a means of powering a city? How is an ammeter wired in a circuit? How is a voltmeter wired in a circuit? Explain how you would find the resistance of a resistor if you had a battery, a resistor, 5 wires, an ammeter, and a voltmeter. You have five 1.5 V cells. Explain how you would  connect them to give:                                                        (a) the highest output potential              (b) a given current for the longest possible time         (c) an output potential of 4.5 V Calculate how much electrical energy is supplied by a 12 V battery when:                                        (a) a charge of 2000 C passes through it.              (b) a current of 3.5 A flows from it for 25 s.                 What is the resistance of the following? (a) A torch bulb that draws 0.25 A from a 12 V supply. (b) An immersion heater that draws 10 A from a 240 V supply.