PHYSICAL QUANTITY

Energy: formulas and units of measurement

Energy: symbol E, W, unit J. Formulas and explanations for Mechanics, Electricity, Magnetism, MCT and thermodynamics.

E,\ W

E, W

\text{Dzh}

joule

KEY CONNECTIONS

Formulas

E_{p} = m g h

Ep = mgh

E_{k} = \frac{m v ^{2}}{2}

Ek = mv² / 2

E_{elastic} = \frac{k ( Δ l ) ^{2}}{2}

Econtrol = k(Δl)² / 2

W_{e} = \frac{C U ^{2}}{2} = \frac{q ^{2}}{2 C} = \frac{q U}{2}

We = CU² / 2 = q²/(2C) = qU/2

W_{m} = \frac{L I ^{2}}{2} = \frac{Φ I}{2}

Wm = LI² / 2 = ΦI / 2

U = \frac{3}{2} \frac{m}{M} R T

U = (3/2)(m/M)RT

NOTATION

Quantities in formulas

$E_{\text{p}}$: Potential energy is the energy of the relative position of bodies or parts of a system.
$m$: Mass is a scalar physical quantity that is a measure of the inertia of a body.
$g$: Gravity acceleration is the acceleration of a body under the influence of gravity without taking into account the resistance of the medium.
$h$: Height - vertical distance from the selected level.
$E_{\text{k}}$: Kinetic energy is the energy of movement of a body.
$v$: Speed is the speed and direction of change in body position.
$E_{\text{elastic}}$: Elastic deformation energy is the energy stored by a deformed body.
$k$: The stiffness of a spring is a characteristic of its resistance to deformation.
$\Delta l$: Elongation is a change in the length of a body during deformation.
$W_{\text{e}}$: Electric field energy is the energy stored by the electric field.
$C$: Electrical capacity is the ability of a conductor or capacitor to accumulate charge.
$U$: Electric voltage is the work done by the electric field when transferring a unit charge.
$q$: Electric charge is a quantity that determines the participation of a body in electrical interaction.
$W_{\text{m}}$: Magnetic field energy is the energy stored in a magnetic field.
$L$: Inductance is the ability of a conductor to create a magnetic field when current passes.
$I$: Current strength is the charge passing through the cross section of a conductor per unit time.
$\Phi$: Magnetic flux is a measure of the magnetic field passing through a surface.
$U$: Internal energy is the energy of movement and interaction of particles of matter.
$M$: Molar mass is the mass of one mole of a substance.
$R$: The universal gas constant is the coefficient of connection between the parameters of an ideal gas.
$T$: Temperature is a measure of the thermal state of the body.

THEORY

PRACTICE

Energy: formulas and units of measurement

Formulas

Quantities in formulas

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