Question

Find the ratio of resistance from the current-voltage graph

Answer 1

V=IR

So, R=V/I

So, from this graph, the resistance is given by 1/slope

slope=(y2-y2)/(x2-x1)

Hence resistance=(x2-x1)/(y2-y1)

For P:                                    For Q:                                            For R:

Resistance=60/3         Resistance=30/2                    Resistance=20/3

Resistance=2 ohm      Resistance= 15 ohm               Resistance=6.67 ohm

Hence, the ratios of the resistances of P:Q:R= 2:15:6.67