What unit measures power?

What unit measures power?

• A. Volts
• B. Amperes
• C. Watts
• D. Ohms

Answer: (C)

Power is the rate at which electrical energy is transferred or consumed. The unit for this rate is the watt, defined as one joule per second. In circuits, power equals voltage times current (P = V × I). That means if you have a device connected to a voltage supply and it draws current, the product of those two quantities tells you how much energy per second the device uses. For example, a device drawing 2 amperes from a 120-volt supply uses about 240 watts of power. Devices are labeled by their wattage to indicate how much energy they consume each second. For larger amounts, we use kilowatts (1 kW = 1000 W). The other fundamental electrical quantities—voltage, current, and resistance—each have their own units: volts for potential difference, amperes for current, and ohms for resistance. Understanding that watts tie voltage and current together helps you see how power changes with either quantity.

Power is the rate at which electrical energy is transferred or consumed. The unit for this rate is the watt, defined as one joule per second. In circuits, power equals voltage times current (P = V × I). That means if you have a device connected to a voltage supply and it draws current, the product of those two quantities tells you how much energy per second the device uses. For example, a device drawing 2 amperes from a 120-volt supply uses about 240 watts of power. Devices are labeled by their wattage to indicate how much energy they consume each second. For larger amounts, we use kilowatts (1 kW = 1000 W). The other fundamental electrical quantities—voltage, current, and resistance—each have their own units: volts for potential difference, amperes for current, and ohms for resistance. Understanding that watts tie voltage and current together helps you see how power changes with either quantity.