Question

To investigation the relation between the ratio 1.output and input voltage 2.number of turns in the secondary coil and primary coil of a self designed transformer.

Answer 1

To investigate the ration or the relationship between ratio 1 ie input to the ratio 2 iee of output in an electrical connectivity then

You need a voltmeter to measure the voltage of power which enters into the system .the system is a bulb connected to a battery .then you also need a voltmeter to measure the voltage across the batteries as power is being used