To calculate watt-hours, you multiply which two quantities?

To calculate watt-hours, you multiply which two quantities?

• A. Time x Wattage
• B. Wattage x Time (expressed in hours)
• C. Voltage x Current
• D. Resistance x Time

Answer: (B)

Watt-hours measure electrical energy and come from multiplying power by time. Use the device’s power in watts and the duration in hours. If the runtime is given in minutes, convert it to hours first (minutes ÷ 60). For example, a 150-watt device running for 2 hours uses 300 watt-hours. If you know voltage and current, you can find watts with P = V × I, but watt-hours come from watts times hours, not volts and amps alone.

Watt-hours measure electrical energy and come from multiplying power by time. Use the device’s power in watts and the duration in hours. If the runtime is given in minutes, convert it to hours first (minutes ÷ 60). For example, a 150-watt device running for 2 hours uses 300 watt-hours. If you know voltage and current, you can find watts with P = V × I, but watt-hours come from watts times hours, not volts and amps alone.