In a DC circuit, the power is the product of which quantities?

In a DC circuit, the power is the product of which quantities?

• A. Current times resistance
• B. Voltage squared
• C. Applied voltage times current
• D. Voltage divided by current

Answer: (C)

Electrical power in a DC circuit is the product of the voltage across a component and the current through it. The instantaneous power delivered to a load is P = V × I, where V is the voltage across the load and I is the current through it. This relationship comes from the definition of power and how voltage and current interact in circuits. If you know the resistance as well, you can also write P = I²R or P = V²/R, but the general expression remains the product of voltage and current. The other forms don’t represent power directly: current times resistance equals voltage (not power) by Ohm’s law; voltage squared isn’t power by itself unless you account for resistance; voltage divided by current gives impedance, not power.

Electrical power in a DC circuit is the product of the voltage across a component and the current through it. The instantaneous power delivered to a load is P = V × I, where V is the voltage across the load and I is the current through it. This relationship comes from the definition of power and how voltage and current interact in circuits. If you know the resistance as well, you can also write P = I²R or P = V²/R, but the general expression remains the product of voltage and current.

The other forms don’t represent power directly: current times resistance equals voltage (not power) by Ohm’s law; voltage squared isn’t power by itself unless you account for resistance; voltage divided by current gives impedance, not power.