Electrical engineering: DC circuits and fundamentals
Ohm's law, power, energy, resistor networks, voltage dividers, conductor resistance, sources with internal resistance and electrostatic forces.
Enter known quantities, select the target, then verify limits with manufacturer data.
Calculators in this category
Ohm's Law Calculator: Voltage, Current and Resistance
Calculate voltage, current or resistance with Ohm's law from the other two electrical quantities.
Open calculator →Electrical Power Calculator from Voltage and Current
Calculate the electrical power of a load from voltage and current with P = U·I.
Open calculator →Electrical Energy Calculator: kWh from Power and Time
Calculate the energy use of an appliance in kWh from rated power and operating time.
Open calculator →Watts to Amps Calculator
Convert watts to amps: calculate the operating current from power and supply voltage for fuse and cable sizing.
Open calculator →Series Resistor Calculator
Calculate the total resistance of resistors connected in series.
Open calculator →Parallel Resistor Calculator
Calculate the equivalent resistance of parallel resistors for current sharing and protection sizing.
Open calculator →Voltage Divider Calculator
Calculate the unloaded output voltage of a two-resistor voltage divider from input voltage and resistor ratio.
Open calculator →Loaded Voltage Divider Calculator
Calculate the actual output voltage of a resistor voltage divider with a connected load.
Open calculator →Terminal Voltage Calculator for DC Sources
Calculate the terminal voltage and internal power loss of a real DC source with internal resistance under load.
Open calculator →Wire Resistance Calculator
Calculate the DC resistance of a conductor from resistivity, length and cross-sectional area.
Open calculator →Force Between Parallel Conductors Calculator
Calculate the force per unit length between two parallel current-carrying conductors in vacuum or air.
Open calculator →Coulomb's Law Calculator
Calculate the electrostatic force between two point charges in vacuum or air from charge magnitude and separation.
Open calculator →Wire Resistance and Voltage Drop Calculator
Calculate the DC resistance of a wire from resistivity, length and cross-section and the voltage drop and power loss at a given current.
Open calculator →Resistance vs Temperature Calculator
Calculate the resistance change of a metallic conductor for a temperature change using its linear temperature coefficient.
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