(1)

Step 1:

Find the Norton $\"\"$ s equivalent resistance.

1.Open the load resistor.

2.Open Current Sources and Short Voltage Sources.

3.Calculate the Open Circuit Resistance. This is the Norton Resistance $\"\"$ .

Redraw the circuit :

$\"\"$

Step 2:

$\"\"$ and $\"\"$ are in parallel.

$\"\"$

$\"\"$ .

$\"\"$ and $\"\"$ are in parallel.

$\"\"$

$\"\"$ and $\"\"$ and $\"\"$ are in series.

$\"\"$

Nortons Resistance is $\"\"$ .

Solution :

Nortons Resistance is $\"\"$ .