Electrical power is calculated by which of the following formulas?

Electrical power is calculated by which of the following formulas?

• A. Power = Voltage × Current
• B. Power = Voltage ÷ Current
• C. Power = Current ÷ Voltage
• D. Power = Voltage + Current

Answer: (A)

Power in an electrical circuit is the rate at which energy is transferred. It depends on both how strong the push is (voltage) and how much charge flows (current). The instantaneous power is the product of these two quantities: P = V × I. This makes intuitive sense: increasing either the voltage or the current increases how much energy per second is delivered, so the power goes up accordingly. The units come out as watts when volts are multiplied by amperes. The other forms don’t describe energy transfer rate: dividing voltage by current gives resistance (ohms), not power, and adding voltage and current doesn’t correspond to a power measure.

Power in an electrical circuit is the rate at which energy is transferred. It depends on both how strong the push is (voltage) and how much charge flows (current). The instantaneous power is the product of these two quantities: P = V × I. This makes intuitive sense: increasing either the voltage or the current increases how much energy per second is delivered, so the power goes up accordingly. The units come out as watts when volts are multiplied by amperes. The other forms don’t describe energy transfer rate: dividing voltage by current gives resistance (ohms), not power, and adding voltage and current doesn’t correspond to a power measure.