Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Ohm's Law Solver (V = IR)

Solves Ohm's Law for voltage, current, or resistance — pick the unknown and enter the other two values. Built on V = I × R, the foundational relationship of every electrical circuit.

Solve For

Voltage (leave 0 if solving for it) (V)

Current (leave 0 if solving for it) (A)

Resistance (leave 0 if solving for it) (Ω)

Electrical

Capacitor Charge Time Calculator

Calculates how long a capacitor takes to charge fully through a resistor, using the RC time constant. A capacitor is considered effectively fully charged after five time constants (5 × R × C).

Resistance (Ω)

Capacitance (µF)

Key differences

	Ohm's Law Solver (V = IR)	Capacitor Charge Time Calculator
Category	Electrical	Electrical
Inputs required	4	2
Result	Result	Full Charge Time (seconds)
What it does	Solves Ohm's Law for voltage, current, or resistance — pick the unknown and enter the other two values. Built on V = I × R, the foundational relationship of every electrical circuit.	Calculates how long a capacitor takes to charge fully through a resistor, using the RC time constant. A capacitor is considered effectively fully charged after five time constants (5 × R × C).