⚡ Electrical & electronics calculator category

Electrical & Electronics Calculators

Explore two free DC circuit tools for LED current-limiting resistors and two-resistor voltage dividers. Use explicit component values, compare current and power, and follow steps based on your inputs.

Showing all 2 Electrical & Electronics calculators.

Black and gold electronics workbench with a circuit board, resistors, LEDs on a breadboard and a digital multimeter

Electrical & Electronics Calculators

LED Resistor Calculator

Calculate a series LED resistor from supply voltage, LED forward voltage and current. Compare ideal, E12 and E24 values, current and resistor power with steps.

LED CircuitsOpen Calculator →

Voltage Divider Calculator

Calculate voltage divider output with two resistors and an optional load, or solve R1 or R2 for a target voltage. See current, resistor power and worked steps.

Resistor NetworksOpen Calculator →

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DC circuit calculations with explicit assumptions

Use the LED tool for one DC series string, including LED voltage drops and an optional E12/E24 nominal resistor. Use the divider tool for an ideal two-resistor ratio, an optional resistive output load, or an unloaded resistor solution.

LED current limiting

Series LED count, forward voltage, target current and resistor dissipation.

Voltage ratios

R1, R2, output voltage and the effect of a resistive load.

Component checks

Worked examples, units, current, power and stated limitations.

Use the component datasheet and the right circuit model

These are positive DC arithmetic models up to 60 V input, not mains wiring, code-compliance or guaranteed component-selection tools. Actual tolerance, temperature, source impedance and dynamic load behavior can change results. The existing Ohm’s Law Calculator and Electrical Power Calculator remain in Physics & Engineering for general relationships.

Electrical & Electronics Calculator FAQs

Which calculators are in this category?

The category currently contains LED Resistor Calculator and Voltage Divider Calculator, each with input-based steps, current and power results.

Are the electrical and electronics calculators free?

Yes. Both tools run in your browser without a sign-up requirement.

Can I calculate an LED resistor for 5V or 12V?

Yes. Enter your DC supply, LED forward voltage, target current and series LED count on the LED Resistor Calculator.

Does the voltage divider include a load?

Yes. Output-voltage mode supports an optional finite resistive load. Solving R1 or R2 uses an unloaded target.

Are these mains wiring or code-compliance tools?

No. These tools model positive DC circuits up to 60 V input. They do not determine wiring compliance, insulation, safety approval or real component suitability.

Can I use these tools on a phone?

Yes. The existing responsive layout supports mobile and desktop screens. Review the inputs, units and limitations before using a result.

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