E_T = E_k + E_p

or

E_k = 1/2 mv^₂

or

Ep = mgh

P=Δw/Δt

Power = Change in work/change in time

I = Q/t

Current = Charge flow/secs

Amperes=Coulumbs/secs

V=IR

Voltage = Current/Resistance

Resistors in series

Resistors in Par.

R_eq= R₁ + R_{2 ..}

1/R_eq + 1/R_{1 +} 1/R₂

Force = ma

Force= mass x acceleration

P= F/A

Pressure = Force / Unit of Area

ΔP = ρgΔh

Change in pressure = density x gravity x Δ in height

ρvA = constant

Density x velocity of fluid x X-sectional area =constant

Σi = 0 at a junction

ΣΔV= 0 in a loop

V= voltage

sum of currents = 0

sum of voltage changes in a loop=0

W=mg

Mass and gravitation constant

ρ = mass /volume

F_b= Vρg = mg 

m = -i/o

image over object

If M= negative = inverted

    If M= Positive = erect image

if i is smaller than o = diminished

L^₁ = F1× r1 (CCW + ve)

L2 = F2× r2 (CW - ve)

∑F=m x a

mass times acceleration

F= K_G(m1m2/ r²⁾

r=distance between bodies

KG is the constant

m1m2=masses

F = k(q1q2/r²⁾

Note: if distance r2 is doubled, force is quartered