Electrical Systems - Formula - Level 3 Flashcards
Charge
Symbol - Q
Unit - Coulombs (C)
Capacitance
Symbol - C
Unit - Farads (F),
1 farad = 1 coulomb per volt
Voltage
Symbol - V
Unit - Volts (V)
Permittivity of free space
Symbol - Ɛo
Unit - Farad per meter (Fm^-1)
Dielectric constant
Symbol - Ɛr
Area of plate
Symbol - A
Unit - Square meters (m^2)
Potential energy
Symbol - Ep
Unit - Joules (J)
Time constant
Symbol - T
Unit - Seconds (s)
Resistance
Symbol - R
Unit - Ohms (Ω)
Distance between plates
Symbol - d
Unit - Meters (m)
Magnetic flux
Symbol - Φ
Unit - Webers (Wb)
Magnetic field strength
Symbol - B
Unit - Teslas (T) or Weber per square meter (Wb m^-2)
Electromotive force (EMF)
Symbol - E
Unit - Volts (V)
Inductance
Symbol - L
Unit - Henrys (H)
Current
Symbol - I
Unit - Amps (A)
Time
Symbol - t
Unit - Seconds (s)
Mutual inductance
Symbol - M
Unit - Henrys (H)
M is a constant which depends on…
- The size of the coils
- The distance between the two coils
- The material inside the two coils
Alternating voltage
Symbol - Vp
Unit - Volts (V)
Number of turns on primary coil
Symbol - Np
Number of turns on secondary coil
Symbol - Ns
Voltage across secondary coil
Symbol - Vs
Units - Volts (V)
Angular frequency
Symbol - ω
Units - Radians per second (s^-1)
Power
Symbol - P
Units - Watts (W) or Joules per second (Js^-1)
Peak current
Symbol - Imax
Units - Amps (A)
Peak voltage
Symbol - Vmax
Units - Volts (V)
Root mean square current
Symbol - Irms
Units - Amps (A)
Root mean square voltage
Symbol - Vrms
Units - Volts (V)
Reactance of a capacitor
Symbol - Xc
Units - Ohms (Ω)
Reactance of an inductor
Symbol - Xl
Units - Ohms (Ω)
Impedance
Symbol - Z
Units - Ohms (Ω)