IGCSE Physics (2019-2020) - Formula (UNIT 4)
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unit for cross-section Area
meter square (m^2)
Unit for current
A - ampere
unit for current
A - current
Unit for charge
C - Coulomb
Rate of electric flow
I = Q/t Q = amount of electric charge in Coulombs t = time I = current
Current formula
I=V/R
Unit for energy
Joules (J)
unit for resistance
Ohms (Ω)
Energy formula
Power x time or current x voltage x time
Transformer equation
Primary voltage/Secondary voltage = Turns on primary/Turns on secondary
Resistivity formula
R=pL/A
unit for potential difference
V- voltage
unit for power
Watts (W)
power formula (resistance)
current (square) x resistance
Charge formula
current x time
Power formula
current x voltage
unit for length (l)
meter (m)
unit for Resistivity (p)
Ωm - Ohms meter
unit for time
s - second