Name and define S.l. unit of resistance. Calculate the resistance of a resisto:r if the current flowing through it is 200 mA, when the applied potential difference is 0.8 V.

Explanation

The SI unit of resistanre is ohm. One ohm is the resistance offered by a conductor when the current passing through it is one ampere and the potential difference across its ends is one volt.
By Ohm.s law V = IR
`R=(V)/(I) =(0.8V)/(0.2A) =4 ` ohm