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Demystifying 1 kWh: Unveiling the Power Behind Your Daily Energy Usage

Have you ever wondered how much power is packed into 1 kWh? Understanding this unit of energy can help us grasp the impact of our daily electricity consumption in a relatable way. Let’s unveil the mysteries of 1 kWh and discover its counterparts in the wild. Let’s dive in!

What is a Kilowatt-Hour?

A kilowatt-hour, otherwise known as a kWh, is a way to measure how much energy you’re using. A kWh equals the amount of energy you would use by keeping a 1,000-watt appliance running for one hour. 


So, if you light up a 100-watt bulb, it’ll take you 10 hours to hit that kWh mark. But with a 2,000-watt device, you’ll reach it in just half an hour. It all comes down to dividing the number of watts in an appliance by 1,000.


A kilowatt-hour is a unit of measure for energy usage. It’s using one kilowatt of power (1000 watts) used for one hour. It’s abbreviated as kWh. In Hong Kong, there is HK$ 1.55 per kWh in Kowloon and New Territories for residents and HK$ 2 per kWh in Hong Kong Island.

What Can 1 Kilowatt-Hour Power?

Each item in your home will use a different amount of power. But if you want to know what 1 kWh can power, here are some examples:

Watching a 50″ LED TV (50 watts): 20 hours

Cooking in the oven (2000 Watts): 30 minutes

Running the refrigerator (300 Watts): 3 hours

Charging smartphone (10 watts): approximately 100 times with 1 kWh

Running a ceiling fan (75 watts): 13.3 hours

Using a laptop (50 watts): 20 hours

Running an A/C (3,000 watts): Cool down your room for approximately 20 minutes

Energizing Tree Planting

To help everyone better understand the concept of 1 kilowatt-hour (kWh), we’ll relate it to something familiar—trees! When we consume electricity, we release carbon dioxide (CO2). Each kWh of electricity generates 0.554 kilograms of CO2. A mature tree can absorb 20 kilograms of CO2 per year, which is equivalent to offsetting 36 kWh of electricity. So, just imagine, the daily electricity consumption of a typical household is equivalent to the carbon absorption of a tree for an entire year.


Unravelling the mysteries of 1 kWh has shed light on the immense power behind our daily energy consumption. From understanding the environmental impact of running appliances to realizing the carbon sequestration potential of trees, this journey has empowered us to make conscious choices for a greener future. Let’s remember that with every kilowatt-hour saved, we contribute to preserving our planet and nurturing a sustainable world for generations to come also puts some extra cash in our pockets. Together, we can harness the power of 1 kWh to create a brighter, greener future.


Click here to learn how to save energy at home

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