Ohm's law/ Non-Ohmic Conductor

Question 1

when varying the current alters the ammeter and voltmeter reading but would the ratio be constant value

Answer 1

yes

in a graph as the line is straight but if you do V/I you would get the same ratio

Question 2

what is the formula

Answer 2

V=IR

if were to find out the ratio/the resistance you need to change the formula to R=V/I

Question 3

what is the following what is it measured in
V
I
R

Answer 3

V- voltage in volts V
I- current in amperes A
R- resistance in Ohms Ω

Question 4

does a non-ohmic conductor have a linear relationship between voltage and current
what about the gradient

Answer 4

no

the gradient will not be constant because the resistance changes when current changes

Question 5

is a filament lamp a ohmic conductor and why

Answer 5

no
because as current increase in the filament its temp increases resistance increases with temperature so the ratio of V to I is not constant