Equations to know: Easy Edition Flashcards
What equation is used to calculate HF?
HF = φ + ek, where φ is the work function and ek is the kinetic energy.
What equation is used to calculate the energy of a Photon?
E = hc/λ where h is planck’s constant (of value 6.626 times 10 to the negative 34th power), c is the speed of light (of value 3 times 10 to the power of 8) and λ is the wavelength.
What equation is used to calculate moment/turning force?
Moment = Fd where F is Force and d is distance.
What equation is used to calculate work done?
Work done = Fd where F is Force and d is distance, work done is energy transferred by a force.
What equation is used to calculate speed?
s = d/t where d is distance and t is time.
What equation is used to calculate acceleration?
a = v/t where v is velocity/speed and t is time.
What equation is used for Newton’s 2nd Law?
F = ma when m is mass and a is acceleration.
What equation is used to calculate Kinetic Energy?
KE = .5mv2 where .5 is half, m is mass, velocity is v which is squared.
What equation is used to calculate Gravitational Potential Energy?
GPE = mgh where m is mass, g is gravity taken as 9.8ms-1 and h as height.
What equation is used to calculate Power?
P = E/t where E is Energy transferred and t is time.
What equation is used to calculate efficiency?
Efficiency = useful output E or P/input E or P times by 100, where E is Energy and P is Power.
What equation is used to calculate current?
I = Q/t where Q is charge and t is time.
What equation is used to calculate voltage?
V = E/Q where E is energy and Q is charge.
What equation is used for Ohm’s Law?
V = IR where I is current and R is resistance.
What equation is used for resistivity?
ρ = RA/L where R is resistance, A is area and L is length.
What equation is used to calculate resistors in series?
Rtot = R1 + R2+ … where R1/R2 are resistors in the circuit.
What equation is used to calculate resistance in parallel?
1/Rtot = 1/R1 + 1/R2 +… where R1/R2 are resistors in the circuit.
What equation in Electricity is used to calculate power?
P = VI where V is voltage and I is current. Or if resistors are in series, then the equation P = I2R = V2 over R where I is current squared, R is resistance, and V is voltage which is squared.
What equation is used to calculate emf?
V = E/Q where E is energy and Q is charge.
What equation is used to calculate internal voltage
V = IR + Ir = I(R + r) where I is current, IR is the voltage of circuit and Ir is the V lost in battery.
What equation is used to calculate drift velocity?
I = Anev where A is area of wire, n is number density, e is charge, v is drift velocity.
What equation is used to calculate Rest energy?
E = mc2 where m is mass and c is speed of light squared.
What equation is used to calculate E of photons?
E of photons = Rest E + Kinetic E.
What is the simplified way for calculating E of photons?
2(HF) = 2mc2 + 2(1/2mv2)
