What values are needed to calculate the maximum available output wattage of a power supply?

To calculate the maximum available output wattage of a power supply, it is essential to utilize the output voltage and output amperage. The formula to determine wattage is based on the relationship between voltage and current, specifically stated as:

Wattage (W) = Voltage (V) × Current (A)

In this context, output voltage represents the potential difference provided by the power supply that can be driven across a load, while output amperage refers to the current that the power supply can supply to that load. By multiplying these two figures, you arrive at the total power output, measured in watts, which indicates the maximum amount of work the power supply can perform in the circuit.

Other options do not focus on the necessary output parameters for calculating output wattage. For instance, input voltage and input amperage pertain to the power supply's input rather than its output capabilities. Similarly, input voltage and resistance, as well as output resistance and current, do not directly relate to the calculation of output wattage. Thus, knowing the output voltage and output amperage is vital for accurately determining the power available for use.