# What is energy and explain mechinacal and electrical energy ?

2
by mayank121

2014-08-29T12:51:02+05:30

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Energy is defined as the capacity to do work.The energy that is created by virtue of position and motion by human or machine effort is called mechanical energy.The energy by the flow of electrons i a medium is said to be electrical energy.
can energy be created ? or converted ?
energy can neither be created nor destroyed .but it can be converted.
sry
2014-08-29T23:54:39+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Energy :

Energy is defined as the capacity of a physical system or a body to perform (useful) work. It is a property of objects. It cannot be created or destroyed. It can be converted from one form into another.

Energy exists initially in the form of potential energy (P.E): gravitational (mechanical) P.E., electrical PE, magnetic PE, chemical PE, elastic PE, nuclear PE etc. Other forms of energy are energies converted from potential energy. When work is done by a gravitational force (Newton's law), electrostatic force (coulomb's law), magnetic force etc., the PE is converted into kinetic energy or other forms.

Mechanical energy:

This is the energy that depends upon the current physical position of the body in a field (that exerts force), like Earth's gravity, and also on the motion (speed) of the body. The former is called the potential energy and later is called Kinetic energy.

Mechanical energy = mechanical P.E + K.E.

Electrical Energy:

This is the capacity to do electrical work. That is, ability to move a charge q across a potential difference of V. The energy and work involved are equal to qV.

A battery has a capacity to convert the chemical energy: it can move a charge q (or electrons) across potential difference V for some time duration, causing a current = dq/dt or V/R, where R is the resistance connected across battery.