A moving-coil instrument has a resistance of 1 0 Ohm and gives a full-scale deflection of 150 divisions with a p.d. of 0.15 V. Calculate the extra resistance required and show how it is connected to enable t instrument to be used as a voltmeter reading up to 15 volts. If the moving coil has a negligible temperature coefficient hut the added resistance has a temperature coefficient of 0.004 Ohm per degree C, what reading will p d of 10 V give at 15°C, assuming that the instrument reads correctly at 0°C.