Formulas for Engineers
Ohm's Law (DC version)
Ohm's Law (AC version)
Kirchhoff's Law
Power
Resistance (Resistors in series)
Resistance (Resistors in parallel)
Inductance
Inductance for LR circuit decay, stored energy is calculated as follows
Capacitance
Capacitance (for n parallel plates)
Capacitance (for RC circuit discharge)
Capacitance (for stored energy)
Capacitance (for capacitors in series)
Capacitance (for capacitors in parallel)
Electrostatics
Electromagnetism
Magnetism
Magnetism (for a magnetic circuit)
Magnetism (for stored energy density)
AC Circuits
Sound
Note that decibels are not units as such but a ratio of voltages, currents and
power, for example:
where: P1, P2 are the power levels:
For differing input and output impedances the following formula is appropriate:
Where V1, V2 are the voltages
Z1, Z2 are the impedances.