A chopper circuit is fed from an input voltage of 20 V delivers a power of 16 watts. If the chopper efficiency is 80 %, then find the value of input current.

To find the input current in the chopper circuit, we can use the formula for power, which is:

[ text{Power} = text{Voltage} times text{Current} ]

The output power ((P_{out})) is given as 16 watts, and the efficiency ((eta)) of the chopper is 80% (or 0.8). The input power ((P_{in})) can be calculated using the efficiency:

[

eta = frac{P_{out}}{P_{in}}

]

So, rearranging this gives us:

[

P_{in} = frac{P_{out}}{eta} = frac{16 text{ watts}}{0.8} = 20 text{ watts}

]

Now, we know that the input power is also equal to the product of the input voltage and the input current:

[

P_{in} = V_{in} times I_{in}

]

Plugging in the values:

[

20 text{ watts} = 20 text{ V} times I_{in}

]

Now, solving for (I_{in}):

[

I_{in} = frac{20 text{ watts}}{20 text{ V}} = 1 text{ A}

]

Thus, the value of the input current is 1 A.