Thermal Energy Flashcards
What are the three methods of heat transfer?
Conduction, Convection, Radiation
What is the equation for Power?
Q/T
What is the equation for the rate of Conduction?
Q/t = kA(Th-Tc/d)
What is the equation for thermal expansion?
Change in Length = aLchange in temperature
Where a is the coefficient of thermal expansion
What are the equations for Newton’s Law of Cooling?
dQ/dt
-hAchngT(t)
-hA(T(t) - Tenv)
Where T(t) is object temp at time t
What increases for hotter objects?
Peak Wavelength
What is a black body?
An object that absorbs all electromagnetic radiation of all wavelengths and can emit all wavelengths
What is Wein’s Displacement Law?
Ymax = 2.93x10^-3 / T
What is Stefan’s Law?
P = EOAT^4
What is the Equation for Intensity?
P / 4pid^2
What is a U value and its units
heat loss per second per square meter for 1K temperature difference
Wm^-2K^-1
What is the P loss equation?
U Value x A x change in temp
How to change Celsius to kelvin
+273
What is internal energy?
KE + PE
What is the Zeroth Law of Thermodynamics?
If two thermodynamic systems are each in equilibrium with a third one the systems will be in equilibrium with each other
What is the Specific Heat Capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1K
Specific Heat Capacity Equation
Q = mc changeintemperature
or
Q = IVt
What is the equation for Thermal Power
P = mcchangeintemperature / t
What is the equation for specific latent heat?
Q = mL where L is specific latent heat
or
L = Q / m1 - m0
How to calculate internal energy?
3/2nRT
