Engineering
Circuits, components, and electrical quantities.
Calculators
Air Changes per Hour Calculator
Calculate an ideal air-change rate from volume flow and room volume.
Battery Energy Calculator
Estimate nominal battery energy from volts and ampere-hours.
Battery Runtime Calculator
Estimate operating time using usable watt-hours and a constant load.
Capacitor Energy Calculator
Calculate energy stored in an ideal capacitor.
Ohm’s Law Calculator
Calculate current through an ideal resistive element.
Parallel Resistance Calculator
Find equivalent resistance for two ideal resistors in parallel.
RC Time Constant Calculator
Find the time constant of a basic resistor-capacitor circuit.
Series Resistance Calculator
Find equivalent resistance for three resistors in series.
Steady Heat Loss Calculator
Estimate steady heat transfer through an assembly from U-value, area, and temperature difference.
U-Value from Thermal Resistance Calculator
Find thermal transmittance from an entered total assembly resistance.
Voltage Divider Calculator
Find the unloaded output of a two-resistor voltage divider.
