(Originais Teachy 2023) - Question Very Hard of Physics

In a physics laboratory, a student needs to measure the current and the potential difference in a complex electrical circuit. For this, he uses an ammeter and a voltmeter, respectively. The ammeter is connected in series to a 20-ohm resistor and the voltmeter is connected in parallel to the same resistor. The voltage source of the circuit is calibrated to provide a constant potential difference throughout the circuit. The voltmeter is an ideal device, while the ammeter has an internal resistance of 0.1 ohms. The student observes that the voltmeter indicates a potential difference of 200 volts and the ammeter registers a current of 5 A. Considering the specifications of the devices and the circuit configuration, calculate the potential difference that the source provides, taking into account the instrument readings. Consider that the readings of the devices correspond to the actual values of the circuit and disregard any thermal effects on the circuit's wires and connectors.