Question

How do you explain the relationship between voltage and current?

Answer 1

Current is the rate at which the charge is flowing.

Voltage is the difference in charge between two points.

The relation between the current(I) and voltage(V) is provided by the Ohm’s law. It states that, the current is directly proportional to the voltage.

=> V α I

Now, we introduce a constant of proportionality (R)

i.e., V=IR

This is the relationship between the current(I), voltage(V) and the resistance(R) as defined by the Ohm’s law. This can be further manipulated into I=V/R and R=V/I whenever required.

Ohm’s law is an empirical law - a generalisation from many experiments which have shown that, for many materials current is approximately proportional to electric field. But this won’t be obeyed in ‘all the cases’. Even some materials are categorised as ‘non-ohmic under weak fields’.

Answer 2

thanks me hope this will help you