What is the resistance of the conductor, the current strength of which is 0.2A at a voltage of 4V?

By the condition of the problem:

I = 0.2 Ampere – current in the electrical circuit;

U = 4 Volts – voltage in the electrical circuit.

It is required to determine R (Ohm) – the resistance of the conductor.

To calculate the resistance of a conductor, you must use the following expression (Ohm’s law for a section of a circuit):

U = I * R, from here we find that:

R = U / I;

R = 4 / 0.2 = 40/2 = 20 ohms.

Answer: conductor resistance R = 20 ohms.