Physics equations Flashcards
Equation for Power involving energy and time?
Including the rearranged equations.
P (W) = E (J) / t (s)
rearranged to : E = Pt
or : t = E / P
What is the equation for current involving charge and time?
Include rearranged equations.
I (A) = Q (C) t (s) or Q = It or t = Q / I
What is the equation for Power involving potential difference and current?
Include rearranged equations.
P = VI or I = PV or V = RI or I = V / R
What is the equation for power loss?
P = I^2R
What is the equation for work involving charge and potential difference?
Include rearranged equations.
W = QV or V = W / Q or Q = W / V
What is the equation for power involving potential difference and resistance?
P = V^2 / R
What is the equation for potential difference involving resistance and current?
V = RI or R = V / I or I = V / R
What is the equation for temperature?
T = 1 / f
What is the equation for efficiency?
efficiency = useful energy output / total energy input
What is the equation for specific heat capacity?
E = mcDELTAt
c = E / mDELTAt
units: c = spec. heat capacity. (J/kgdegreesC)
E = energy (J)
m = mass (kg)
DELTAt = change in temp (K or degrees C)
What is the equation for work done?
work done (J) = force (N) x distance (m)
What is the equation for gravitational potential energy?
Ep (J) = m (kg) g (N/kg) h (m)
What is the equation for kinetic energy?
Ek = 1/2mv^2 v = speed (m/s) m = mass (kg) Ek = ke (J)
What is the equation for elastic potential energy?
Ee = 1/2ke^2
k = spring constant (N/m) e = extension (m) Ee = epe (J)
What is the equation for the change in thermal energy?
DeltaE = mcDeltaTheta
What does gravity equal?
9.8 N/kg or 10 rounded
What is the equation for gradient?
Change in height / Change in base
What is the equation for energy in terms of potential difference and charge?
E = VQ or V = E / Q or Q = E /V
What is the equation for volume involving mass and pressure?
V = m / p or p = m / V or m = Vp
What is the equation for pressure?
P = F / A P = (N/m^2) F = (N) A = (m^2)
What is the equation for density?
Density = mass / volume
What is the equation for pressure when Boyle’s law governs these variable?
P = constant x 1 / V (P = K / V) rearranged PV = constant (PV = K) or V = constant x 1 / P (V = K / P)
What is the constant?
a number that doesn’t change ( can change in different scenarios)
