PreQ Physics - Term 3 Formulas

current formula

I = Q/t

Voltage formula

V = IR

Resistance formula

R = (Rho * length) / Current

Fleming’s hand rules

Thumb = Motion
Second = Field
Third = Current

Left hand rule vs right hand rule

Left for Motors, right for generators

Total current in a series circuit

i1 = i2

emf formula

E = W/Q

total voltage in a series circuit

Vt = v + v + v…

Total resistance in a parallel circuit

1/Rt = 1/r + 1/r + 1/r …

Total current in parallel

It = i + i + i…

Total resistance in a series circuit

Rt = r + r + r…

Orbital speed formula (general)

v = 2pir/t

Gravitational field strength formula

g = f/m

Centripetal force formula

mv2/r

Gravitational attraction between two masses

Fg = GMm/r2

Orbital speed formula (with Gravity)

sqr(GM/r)

Hubble constant number

2.3×10^-18/s

Hubble constant formula

H0 = v/d

speed of light

3×10^8m/s