How does load current varies with the load?

They are inversely proportional.With a constant voltage, current decreases with an increase in resistance and increases and resistance decreases.

Load current is related to load resistance by an inverse relationship. The load current increases linearly as load resistance decreases. Remember, the less resistance, the more current.

2 to 5% of full load current

It is a the current drawn by the application that is connected to the power source

Full load current can be calculated by the formula given below: P=SQUARE ROOT OF 3*V*I*POWER FACTOR P=1.732*V*I*PF suppose 3 kw motor three phase voltage assuming .85 power factor and 415 volt...