How is power calculated in an electric circuit?

Power in an electric circuit is calculated using the formula that relates voltage, current, and power. This formula states that power is the product of voltage and current. When you multiply the voltage (measured in volts) by the current (measured in amperes), the result is the power (measured in watts). This relationship is essential in electrical engineering and is fundamental to understanding how electrical devices consume power.

For practical applications, this means if you know the voltage across a device and the current flowing through it, you can easily determine how much power that device is using. This principle is widely used in circuit design, troubleshooting, and performance evaluations of electrical systems, making it a crucial concept for anyone working in power engineering.

The other formula options given involve different aspects of electrical theory but do not directly reflect the basic power calculation in typical circuits as succinctly as the product of voltage and current does.