Solve Ohm's Law Homework
Check circuit problems by entering any two known values.
💡 Ohm's law: V = I × R. Power adds P = V × I. Knowing any two lets you derive the rest — handy for sizing resistors, checking LED current, or working out heat dissipation.
Students tips
The core relationships are V = I × R and P = V × I — every other formula is derived from these two.
Enter the two values your problem gives you and verify your hand calculation against the result.
Watch your units: volts, amps (not milliamps), and ohms. Convert mA to A by dividing by 1000.
Cách hoạt động
Tại sao chọn của chúng tôi?
Also check out…
Size a Current-Limiting Resistor for an LED
Work out the resistor value an LED needs from supp
Calculate Power Dissipation (Watts)
Find how many watts a component dissipates so you
Estimate Current Draw from a Battery
Find the current a load pulls so you can estimate
Calculate Voltage Across a Component
Find the voltage drop across a resistor from curre