- #1
mc2_phy
- 12
- 0
Came across these questions
What is meant by?
Energy use
Energy storage
Energy expenditure
What is meant by?
Energy use
Energy storage
Energy expenditure
To have energy is the ability to perform work.Energy use
Energy storage
mc2_phy said:Came across these questions
What is meant by?
Energy use
Energy storage
Energy expenditure
tomdam said:I am curious about the units that comprise joules: kg * m2/s2.
I understand that a joule is essentially a Newton * Meter. I understand that a Newton is a measurement of acceleration and that a joule, therefore, is simply the measurement of acceleration over a distance (hence, Joules equals Newton*M)... that is, if I'm not misunderstanding things.
However, this description of energy is confusing to me. To me, this doesn't seem to describe what energy is. Instead, it seems to just describe what energy does. Energy is defined as the ability to perform work, but that just sounds like we're describing the effect of energy. The idea I have of energy is elusive and abstract; so it seems there is an injustice to having such a simple, "materialistic" definition of it.
Some examples scenarios of what confuses me: When we say that heat is energy, are we just describing the distance molecules will accelerate in response to heat stimuli?
When electrons relax and emit light, where is the energy there? Are photons the mass that is being accelerated? Or is light just the byproduct of negative energy? And if light is just a byproduct of negative energy, shouldn't there be something more to the definition of energy if something as phenomenal as light can be produced from it?
Maybe there is too much baggage to the word energy? Maybe I am conflating the popular idea that energy is a pseudo-natural presence with the physics definition of energy?
Really?ZapperZ said:Maelstorm attraction at the Norway Pavilion, Epcot.
Zz.
"What it is, what it shall be, what it was." -Robin Williams as Adrian Cronauer as Walter Cronkitetomdam said:I understand that a joule is essentially a Newton * Meter.
However, this description of energy is confusing to me. To me, this doesn't seem to describe what energy is. Instead, it seems to just describe what energy does.
Like moving an electric car.tonyjk said:I have also a question : the energy carried by an ElectroMagnetic wave has the ability to perform work like what?
Energy is very easy to understand because it is clearly defined. The problem is that people are not satisfied with the definition because for some reason they feel like it should be more complicated than it is.Drakkith said:I don't even know what "pseudo-natural presence" means. Energy is clearly defined in physics, even if it is not easy to understand.
tonyjk said:I have also a question : the energy carried by an ElectroMagnetic wave has the ability to perform work like what?
Energy use refers to the amount of energy consumed by individuals, organizations, or countries. It includes the use of all types of energy, such as electricity, natural gas, and renewable sources like solar and wind power.
Energy can be stored in different forms, such as chemical, mechanical, or electrical energy. Some common methods of storing energy include batteries, compressed air, and pumped hydroelectric storage.
Energy expenditure is the amount of energy that is used for physical activity and metabolism, while energy consumption is the total amount of energy that is consumed by an individual or organization. Energy expenditure is a subset of energy consumption.
Energy use has a significant impact on the environment, primarily through the emissions of greenhouse gases and other pollutants. The burning of fossil fuels for energy is a major contributor to climate change and air pollution, which can have harmful effects on human health and the environment.
There are several ways to reduce energy expenditure, including using energy-efficient appliances and vehicles, conserving energy at home and in the workplace, and utilizing renewable energy sources. Additionally, individuals can reduce their energy expenditure through lifestyle changes, such as walking or biking instead of driving, and using public transportation when possible.