01 / PATH
Electronics fundamentals
Voltage, current, resistance and components.
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Energy used2.4 kWh
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⚡Ohm’s lawFind current, voltage, and resistance.⚡LED resistorProtect LEDs with the right value.⚡Parallel resistorsCombine resistances correctly.
◉Electricity costEstimate usage in your currency.◉Battery runtimeEstimate available operating time.◉Voltage dividerExplore how voltage is divided.
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02 / PATH
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03 / PATH
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⚡ElectricalElectricity cost calculatorEstimate energy use and cost from watts, hours, days and your local rate.Open tool ΩElectricalOhm’s lawCalculate current and power from voltage and resistance.Open tool ◈ElectricalVoltage dividerCalculate the output of a two-resistor voltage divider.Open tool ✦ElectricalLED resistorFind a current-limiting resistor for one DC-powered LED.Open tool ∑ElectricalSeries resistorsAdd resistor values to find total series resistance.Open tool ∥ElectricalParallel resistorsFind the equivalent resistance of two or three parallel branches.Open tool ▣ElectricalBattery runtimeEstimate how long a battery will power a constant load.Open tool %EverydayPercentage calculatorFind a percentage of any amount in seconds.Open tool ↓EverydayDiscount calculatorCalculate the savings and final price after a discount.Open tool ⇄EverydayUnit converterConvert length, mass or temperature without installing an app.Open tool ↗BusinessProfit marginCalculate gross profit, profit margin and markup.Open tool ▤BusinessTechnician quote builderEstimate a job selling price from materials, labor and your target margin.Open tool ◉BusinessCompound interestEstimate how savings grow with monthly deposits and compounding.Open tool▤BusinessLoan payment calculatorEstimate monthly fixed payments and total interest on a loan.Open tool∑EverydayWeighted average calculatorCalculate a final score from three grades and their relative weights.Open tool↔EverydayDirect proportion calculatorSolve direct proportions and understand the calculation step by step.Open tool◫BusinessBreak-even calculatorFind how many units you need to sell to cover fixed expenses.Open tool✧EverydayTip and bill split calculatorCalculate tip, total bill, and how much each person pays.Open tool
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01 / GUIDE
Ohm’s Law Explained: Voltage, Current and Resistance
Learn Ohm’s law with formulas, worked examples and practical circuit explanations. Check your answers with a free interactive calculator.
Start learning ↗02 / GUIDEHow to Calculate Electricity Use in kWh
Learn how to estimate kWh and electricity cost using watts, hours and the price per kWh, with a worked example.
Start learning ↗03 / GUIDEProfit Margin vs. Markup: Definitions and Examples
Understand the difference between profit margin and markup with formulas and a worked pricing example.
Start learning ↗04 / GUIDECompound Interest Explained Step by Step
Learn compound interest with a formula, worked example, periodic contributions and the limitations of financial projections.
Start learning ↗TEST YOUR KNOWLEDGE
One minute. One question.
With a 100 Ω resistor connected to a 12 V source, what current flows?
Learn Ohm’s law ↗V = 12 VR = 100 ΩI = ?