Can someone help me please? I’ve been trying to solve these questions all day.

#16
If we put a resistor in circuit it will slow the speed of current
Let's check ohms law
[tex]\\ \rm\Rrightarrow \dfrac{V}{I}=R[/tex]
#17
Again use ohms law
[tex]\\ \rm\Rrightarrow V=IR[/tex]
[tex]\\ \rm\Rrightarrow V\propto I[/tex]