Power and Energy

In science, the amount of work accomplished or energy released per unit time is referred to as power. A lightbulb with a larger wattage, such as 100W, will, for instance, produce a brighter light than one with only 40W. This shows how much more energy the higher wattage bulb emits when compared to the lower wattage bulb. The capability of the body to conduct work is referred to as energy. The energy and work units are the same.

Power

In physics, power is defined as the amount of energy transferred or converted per unit of time. In the International System of Units, a watt is equal to one joule per second. A scalar quantity is denoted by the term “power.” 

The product of the torque produced by a motor and the angular velocity of its output shaft is the motor’s output power. Similarly, the power expended in a circuit’s electrical part is the product of the current running through it and the voltage across it.

Power is the time derivative of work; it is the rate at which work is completed with respect to time:

P=dW/dt

where P denotes power, W denotes work, and t denotes time.

The work done is defined as when a constant force F is applied across a distance x.

W=F.x

In this context, power can be expressed as follows:

P=dW/dt=d/dt(F.x)=F.dx/dt=F.v

Formula of power

The following is a formula for defining power.

P=dW/dt

As previously stated, power is a metric that indicates how much work is completed over time. The 750 J/s can be further split down to determine the force per distance over time in this situation. 

Units of power

Energy divided by time is the power dimension. The watt (W), that is equal to one joule per second in the International System of Units (SI), is the unit of power. Horsepower is another frequent and conventional metric.

Types of power

The following are the several types of power:

Mechanical power

That which results from the application of force to a stiff or deformable solid.

Electrical power

It measures the amount of energy delivered in a system or circuit per unit of time, rather than work.

Heat output 

It is the quantity of heat released into the environment by a body per unit of time.

Sound power

It is defined as the amount of energy carried by a sound wave across a certain surface per unit of time.

Energy

Energy is defined as the capability to accomplish work in physics. Potential, kinetic, thermal, electrical, chemical, radioactive, and other types of energy exist. Heat and work—that is, energy in the transmission of energy from one body to another—are also present. Once energy has been delivered, it is always identified by its type. As a result, heat may be turned to thermal energy and work can be transferred to mechanical energy. 

Motion is connected to all sources of energy. When a body is in motion, for instance, it has kinetic energy. Even while at rest, a tensioned device like a bow or spring has the capacity to create motion; its arrangement includes potential energy. Nuclear energy is also potential energy since it arises from the arrangement of subatomic particles in an atom’s nucleus.

Other methods of converting energy from one form to another exist. Many types of techniques, such as fuel-burning heat engines, generators, batteries, fuel cells, and magnetohydrodynamic systems, produce usable mechanical or electrical energy.

In SI Unit, energy is calculated in joules (SI). One joule of work is generated by a one-newton force acting over a one-meter distance. 

A number of articles deal with energy. See principles of physical science, mechanics, thermodynamics, and energy conservation for further information on the evolution of the idea of energy and the principle of energy conservation. See coal, solar energy, wind power, nuclear fission, oil shale, petroleum, electromagnetism, and energy conversion for the key sources of energy and the mechanisms through which energy transitions from one form to another.

Types of energy

There are different forms of energy some of them are given below:

Chemical energy

The energy contained in the bonds of chemical compounds is referred to as chemical energy (atoms and molecules). In a chemical reaction, chemical energy is released, most commonly as heat. Chemical energy is used in fuels such as wood and coal, for example, when they are burned.

Electrical Energy

The energy produced by moving electrons in an electric conductor is known as electrical energy. It is one of the most widely used and beneficial kind of energy. Electrical energy can also be converted from other forms of energy.

Thermal energy

The energy that a substance or system has in relation to its temperature, that is the energy of moving or vibrating molecules, is known as thermal energy. We use sun radiation to cook food, for instance.

Relation between Energy and Power

The ability to conduct work W or make a change is referred to as energy E.

The link between energy and work is thus defined in the definition. Energy is the source of our capacity to work. Work cannot be completed without the use of energy.

Conclusion

In physics, power is defined as the amount of energy transported or converted per unit time. The watt is a unit of power which is equivalent to one joule per second in an SI unit. In ancient writings, power was often described as activity. 

The formula for defining power is as follows.

P=dW/dt