Physics

Physics

Problem

1 kilowatt-hour corresponds to how many joules? a) 3.6×103 J3.6 \times 10^{3}\ \text{J} b) 3.6×109 J3.6 \times 10^{9}\ \text{J} c) 3.6×106 J3.6 \times 10^{6}\ \text{J} d) 1.0×106 J1.0 \times 10^{6}\ \text{J}
Intuitive explanation

Energy unit conversion is about understanding what each unit actually measures. A kilowatt-hour combines power (kilowatts) and time (hours), so you need to convert both to SI base units: watts to joules per second, and hours to seconds. Multiply these conversion factors together to bridge from the everyday electricity unit to the fundamental joule.

Intuitive explanation

Energy unit conversion is about understanding what each unit actually measures. A kilowatt-hour combines power (kilowatts) and time (hours), so you need to convert both to SI base units: watts to joules per second, and hours to seconds. Multiply these conversion factors together to bridge from the everyday electricity unit to the fundamental joule.

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