Motion - Electrical Formulas

MOTION

Force (F) in Newtons

Mass (m) in Kg

Distance (s) in metres

Velocity (v) in metres/second

Initial velocity (u) in metres/second

Acceleration (a) in metres/second/second

Time (t) in seconds

 

F = ma

v = u + at

v² = u² + 2as

s = ut + ½at²

s = vt – ½at²

s = ½(u + v)t

 

LINEAR POWER

Power(W) = Force(N) x Speed(m/s)

 

ROTATIONAL POWER

Power(W) = Torque(Nm) x Speed(rpm)
                                    9.5493

 

ELECTRICAL

Power (P) in Watts

Apparent Power (S) in Volt-Amps

Potential Difference (V) in Volts

Current (I) in Amps

Resistance (R) in Ohms

Impedance (Z) in Ohms

Power Factor (cosθ) where θ is the phase angle of the circuit’s impedance

 

FOR DC

V = IR

P = VI = I²R =V²/R
 

FOR SINGLE PHASE AC

P = VI cosθ = I²R  

S = VI = I²Z
 

FOR THREE PHASE AC

P = √3 VI cosθ 

S = √3 VI

 

MULTIPUL RESISTANCES
 

IN SERIES

R = R1 + R2 + R3 +…+ Rx
 

IN PARALLEL

1      1       1      1             1
R = R1 + R2 + R3 +…+ Rx