Explanation

The supply voltage in a circuit can be determined by using Ohm's law, which states that the current flowing through a resistor is directly proportional to the voltage across it, and inversely proportional to its resistance.

Ohm's law can be represented by the equation: V = I x R

Where: V is the supply voltage (in volts) I is the current flowing through the resistor (in amperes) R is the resistance of the resistor (in ohms)

Given that a current of 2 amperes flows through a 10-ohm resistor, the supply voltage can be determined by plugging in the values into the equation: V = 2 amperes x 10 ohms V = 20 volts

So, the supply voltage in the circuit is 20 Volts if a current of 2 amperes flows through a 10 ohm resistor. This equation is also known as Ohm's law, and it is one of the most fundamental laws of electrical engineering. The same can be derived by calculating the power (P) and substituting P = VI