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energy
/ˈɛnəd͡ʒi/
In most contexts, "energy" is an uncountable noun. This means you usually do not use it in the plural form (energies) when talking about power or vitality. When referring to physical resources like electricity or gas, it is often used with adjectives such as "renewable," "clean," or "sustainable." When describing a person's mood or personality, phrases like "high energy" or "low energy" are common ways to describe how active or tired someone seems.
💬Casual Conversation
I'm totally tapped out. I have zero energy for this next chapter.
Same, but we can't just flake now. We're almost done.
Meanings
Examples
We need to find a more sustainable source of energy.
I just don't have the energy to deal with this today.
God, your energy is just totally draining me right now!
Listen, I've got the energy to crush this project, boss.
Does this house use solar energy or just the grid?
I'm exhausted; I have absolutely zero energy left for dessert.
The kids have way too much energy for this flight!
I really love the energy you're bringing to the team.
Collocations & Compounds
renewable energy
Energy from a source that is not depleted when used, such as wind or solar power.
energy efficiency
The goal of reducing the amount of energy required to provide products and services.
burst of energy
A sudden increase in physical or mental vitality.
energy crisis
A significant shortage of available fuel or power resources.
high energy
Possessing a great deal of vitality, enthusiasm, or activity.
Idioms & Sayings
burst of energy
A sudden, short period of high activity or vitality.
drain someone's energy
To exhaust a person's physical or mental strength.
put your energy into something
To devote a great deal of effort and enthusiasm to a particular task.
low on energy
Feeling tired or lacking the vitality needed for activity.
Cultural Context
At the heart of every single event in the cosmos—from the silent collision of two distant galaxies to the blink of a human eye—lies one of the most profound laws of physics: the First Law of Thermodynamics. This law dictates that energy cannot be created or destroyed; it can only be transformed from one form into another. This concept, known as the conservation of energy, suggests that the total amount of energy in the universe is constant, a cosmic ledger that always balances perfectly.
Consider the journey of a single photon of light traveling from the sun to Earth. It begins as nuclear energy deep within the solar core, transforms into electromagnetic radiation as it traverses the vacuum of space, and finally becomes chemical energy when absorbed by a leaf during photosynthesis. That same energy then fuels the growth of a plant, which might be eaten by an animal, eventually becoming the kinetic energy that allows a creature to move or the thermal energy that keeps its body warm. We are, in essence, walking repositories of ancient starlight.
However, there is a bittersweet side to this story: entropy. While energy is conserved, it tends to spread out and become less useful over time. This 'heat death' theory suggests that trillions of years from now, all energy will be distributed evenly across the universe, leaving no gradients to power stars or sustain life.
Yet, in our current epoch, this fluidity is what makes existence possible. The human experience is a constant exchange of energy—the electrical impulses firing in our synapses, the chemical bonds breaking in our mitochondria, and the emotional energy we pour into our passions. Understanding that we are not separate from the universe's energy, but rather temporary vessels for it, transforms science into something akin to poetry. We are not just observing the laws of physics; we are the living manifestation of a 13.8-billion-year-old energy transfer.