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,\ WE, W\text{Дж}joule
KEY CONNECTIONS
Formulas
E_{\text{п}}=mghEп = mgh
E_{\text{к}}=\frac{mv^2}{2}Eк = mv² / 2
E_{\text{упр}}=\frac{k(\Delta l)^2}{2}Eупр = k(Δl)² / 2
W_{\text{э}}=\frac{CU^2}{2}=\frac{q^2}{2C}=\frac{qU}{2}Wэ = CU² / 2 = q²/(2C) = qU/2
W_{\text{м}}=\frac{LI^2}{2}=\frac{n\Phi I}{2}Wм = LI² / 2 = nΦI / 2
U=\frac{3}{2}\frac{m}{M}RTU = (3/2)(m/M)RT
NOTATION
Quantities in formulas
- E_{\text{п}}
- 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{к}}
- Kinetic energy is the energy of movement of a body.
- v
- Velocity is the rate and direction of change of a body's position.
- E_{\text{упр}}
- 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{э}}
- 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{м}}
- 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.
- n
- Concentration is the number of particles per unit volume.
- \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
Related Lessons
Efficiency and mechanical energy7 class · 24 min→Temperature and internal energy8 class · 22 min→Work, power and conservation of energy9 class · 30 min→Binding energy, fission and reactor9 class · 32 min→Work, power and energy10 class · 28 min→Internal energy and the first law10 class · 26 min→Capacitors10 class · 28 min→Magnetic flux and induction11 class · 30 min→Mechanical oscillations11 class · 28 min→Photons and the photoelectric effect11 class · 30 min→Atomic nucleus and radioactivity11 class · 32 min→
PRACTICE
Related tasks
Work, power and energy7 class · 27 problems→Thermal phenomena8 class · 36 problems→Work and Energy9 class · 9 problems→Nuclear physics9 class · 18 problems→Conservation laws10 class · 29 problems→Thermodynamics10 class · 24 problems→Electrostatics10 class · 30 problems→Magnetism11 class · 23 problems→Oscillations and waves11 class · 48 problems→Quantum physics11 class · 23 problems→Nuclear physics11 class · 20 problems→
DIRECTORY