Voltage needed to raise current to 3.75a using 20,20,200 resistor set

The voltage needed is 35.7 V

Explanation:

Assuming that the resistors are arranged in parallel combination.

For the resistors arranged in parallel combination:

We are given:

Using above equation, we get:

Calculating the voltage by using Ohm's law:

        .....(1)

where,

V = voltage applied

I = Current = 3.75 A

R = Resistance =

Putting values in equation 1, we get:

Hence, the voltage needed is 35.7 V

There are six different ways to arrange those resistors.

Each way leads to a different answer.

You didn't tell us how you want them connected.

The attached drawing shows them all.