Energy
'ɛnərʤi
Definitions
2 meaningsThe ability to do work; the power or capacity to be active; or the fuel or power source.
'ɛnərʤi
The capacity of a physical system to do work.
The sun is a primary source of energy for the Earth.
💡 Simply: Energy is like the 'go-power' that makes things happen. It's what lets a car drive, a light bulb shine, or you run around! Think of it like the food you eat – it gives you the energy to play!
👶 For kids: Energy is what makes things GO! Like when you run around, you use energy from your food!
More Examples
Humans need a constant supply of energy from food to function.
Nuclear energy is a controversial topic due to safety concerns.
How It's Used
"The kinetic energy of a moving object is proportional to its mass and velocity."
"Sustainable energy sources are vital for reducing carbon emissions."
Vigor; enthusiasm; active use of effort.
'ɛnərʤi
Vigor or vitality.
The speaker delivered his speech with infectious energy.
💡 Simply: Energy is like a boost of 'oomph' – when you're excited, ready to go, and full of life! Like when you're so happy you can't stop dancing!
👶 For kids: Energy is feeling happy and ready to do things!
More Examples
The children played with boundless energy in the park.
A balanced diet is crucial for maintaining high energy levels.
How It's Used
"She approached the project with great energy and enthusiasm."
"After a good night's sleep, he woke up feeling full of energy."
Idioms & expressions
high energy
Full of vigor and enthusiasm.
"The concert featured a high-energy band that kept the audience dancing all night."
low energy
Lacking vigor or enthusiasm.
"The team's performance was low energy, leading to a disappointing result."
From Greek *energeia* ('activity, operation'), from *en* ('in') + *ergon* ('work'). The concept evolved through physics to describe the capacity to do work.
The concept of energy, as we understand it today, developed in the 19th century, initially in the context of thermodynamics and mechanics.
Memory tip
Think of a battery; it stores energy to power a device.
Word Origin
"work"