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Electric Current and Charges
Finding electric current formula

I = ^Q/_t
 
where
I = electric current (ampere)
Q = electric charges (coulomb)
t = time (sec)

Electric Current, Voltage and Resistance

Ohm's Law

V = IR

where
V = voltage (volt)
I = electric current (ampere)
R = electric resistance (Ω)

Series and Parellel Circuits:

3 resistors in series arrangement

I = I₁ = I₂ = I₃
V = V₁ + V₂ + V₃
V = I (R₁ + R₂ + R₃)
where
I = total current through circuit
V = total voltage of the three resistors

3 Resistors in parallel arrangement
V = V₁ = V₂ = V₃
I = I₁ + I₂ + I₃
where
I = total electric current through the circuit
V = the total voltage of the three resistors

Kirchhoff Laws:
Kirchhoff current

Σ I_in = ΣI_out

Kirchhoff voltage

Σ ε + Σ IR = 0

Electric Power and Energy Formulas

P = V I

P = ^V2/_R

P = I² R

where:
P = power (watt)
I = electric current (ampere)
R = electric resistance (Ω)
V = voltage (volt)

Power and Energy

W = P t

where:
P = power (watt)
W = energy (joule)
t = time (sec)