What does conductivity have to do with solutions?

The relationship between conductivity and the number of ions in solution means that it can be used to measure solution concentration and give a value for Total Dissolved Solids. This means that measurements are of the total concentration of ions in solution not the concentration of any one ion.

8) 45 volt

9) 8 ohms

100 volt

Explanation:

using ohms law all through

8) v = 3×15

9) R= 120/15

the last V=100×1