How is energy calculated?
As every engineer knows, energy calculation is straightforward. The unit of electrical energy is the kilowatt-hour (kWh), found by multiplying the power use (in kilowatts, kW) by the number of hours during which the power is consumed. Multiply that value by the cost per kWh, and you have the total energy cost.
What is energy in terms of power?
In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second.
What is the relationship between energy power and work?
Power is the rate at which work gets done and it is a scalar quantity. Thus power is equal to work done divided by the time taken. When work gets done, there is a consumption of an equal amount of energy. This is why power is also defined as the rate of energy consumption.
Is energy equal to work?
Equations. The net work on an object is equal to the object’s final kinetic energy minus the initial kinetic energy.
Can matter be converted into energy?
Matter can be converted into energy by annihilation, fission, and fusion. Annihilation occurs when an electron and a positron meet. They annihilate each other and produce two γ ray photons, each with an energy of 511 keV.
How is energy converted into mass?
For any type of energy to be converted to mass, a nuclear reaction (or something similar) is required that absorbs energy and releases a particle that has rest mass. If an object gains energy it gains mass, and if an object gains mass it equivalently gains energy. This is called rest-mass energy.
What is relation between matter and energy?
Energy is a property that matter has. The same amount matter can have different amounts of energy and so represent different states of matter. For example, if you add energy to an ice cube made of water, it becomes liquid water, and if you add even more energy, it becomes steam.
What is C in mc2?
c = Speed of light. from the Latin term celeritas, which means “speed” 2 = Squared. when you “square” something, you multiply it by itself.
What are the applications of relativity?
The theory explains the behavior of objects in space and time, and it can be used to predict everything from the existence of black holes, to light bending due to gravity, to the behavior of the planet Mercury in its orbit.
What is energy according to Einstein?
According to Einstein, energy and mass are equivalent (that’s the message of E=mc2), so piling up energy is exactly like piling up mass. Go big enough, and the amount of energy in the quantum fields becomes so great that it creates a black hole that causes the universe to fold in on itself.
What is a simple example of relativity?
One example of relativity is to imagine two people on a train playing ping-pong. The train is traveling at around 30 m/s north. When the ball is hit back and forth between the two players, the ball appears to the players to move north at a speed of around 2 m/s and then south at the speed of 2 m/s.