How are watts calculated in a DC circuit?

In a DC circuit, power measured in watts is calculated using the formula that states power equals voltage multiplied by current. This relationship is derived from Ohm's Law and represents the straightforward way to determine how much electrical energy is being consumed or converted in a circuit.

When voltage is applied across a load, current flows through that load. The power (in watts) that the circuit consumes or produces can be determined by simply taking the voltage (in volts) and multiplying it by the current (in amperes). This relationship is fundamental in electrical engineering and is critical for understanding circuit applications, load calculations, and the design of electrical systems.

The other options focus on different electrical properties. While current multiplied by resistance pertains to Ohm's Law (V = I × R), and resistance multiplied by voltage does not represent a standard electrical calculation, they do not yield power directly. Power multiplied by time relates to energy consumption over time, which is measured in watt-hours, not in watts directly. Thus, the correct approach to calculating watts in a DC circuit is indeed voltage multiplied by current.