Question

Define 1 ohm and 1 amphere

Answer 1

1 ohm is the resistance across a resistor in which flows a current of 1 A when maintained at a constant potential difference of 1V..
1 A is nothing but one coulumb of charge passing through a point in a sec

Answer 2

1 ohm is the resistance when a current of 1 ampere flows across a cross section of potential difference 1 volt.

1 ampere is the current which flows with charge of a 1 coloumb in one second.

Hope it helps!