What is the formula used to calculate electrical power in a DC circuit?

The formula used to calculate electrical power in a direct current (DC) circuit is based on the relationship between voltage, current, and power. Specifically, power (P) is defined as the product of voltage (E) and current (I). In this context, power is measured in watts (W), voltage in volts (V), and current in amperes (A).

This relationship is derived from Ohm's Law, which states that voltage equals current multiplied by resistance (E = I * R). When you rearrange this relationship in terms of power, you find that P = E * I, meaning the electrical power is generated by the flow of current through a voltage difference.

Understanding this fundamental principle is crucial for anyone involved in electronics and ham radio operations, as it helps in designing, troubleshooting, and understanding circuits effectively.