What is a Kilowatt hour? | Summary and Q&A

TL;DR

Kilowatt hours are a unit of energy, calculated by multiplying power (in kilowatts) by time (in hours).

Key Insights

• 💦 Power is the amount of energy transferred per unit time, while energy is the ability to do work.
• ⌛ Energy is calculated by multiplying power (in kilowatts) by time (in hours).
• ⌛ Kilowatt hours are a unit of energy commonly used to measure electricity consumption.
• ⌛ One kilowatt is equal to 1000 watts, and one kilowatt hour is equivalent to 3.6 × 10^6 joules.
• ⌛ Energy consumption can be calculated by multiplying power (in kilowatts) by time (in hours).
• ⌛ The cost of energy consumption can be found by multiplying the energy consumption (in kilowatt hours) by the utility rate (in cents per kilowatt hour).
• ☠️ When calculating energy consumption costs, it's essential to consider the utility rate, which can vary.

Transcript

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Questions & Answers

Q: What is the difference between energy and power?

Energy is the ability to do work, while power is the amount of energy transferred per unit time.

Q: How do you calculate the energy consumption of a device in kilowatt hours?

Multiply the power of the device (in kilowatts) by the time it is used (in hours).

Q: How do you convert watts to kilowatts?

Divide the number of watts by 1000 to convert them to kilowatts.

Q: What is the conversion factor between kilowatt hours and joules?

One kilowatt hour is equivalent to 3.6 × 10^6 joules (3.6 megajoules).

Summary & Key Takeaways

• Power is the amount of energy transferred per unit time, while energy is the ability to do work.

• Kilowatt hours are a unit of energy obtained by multiplying power (in kilowatts) by time (in hours).

• You can calculate energy consumption by multiplying the power of a device (in kilowatts) by the time it is used (in hours).