What is the voltage across the 4 ohm resistor through which the 0.5 A current flows?

Given:

R = 4 Ohm – resistor resistance;

I = 0.5 Ampere – the magnitude of the current that passes through the resistor R.

It is required to determine U (Volt) – the voltage at the ends of the resistor R.

Since the problem statement is not specified, voltage losses are not taken into account.

Then, to determine the voltage, you must use the following formula (Ohm’s law):

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

U = I * R = 4 * 0.5 = 2 Volts.

Answer: the voltage at the ends of the resistor is 2 volts.