Electricity Tool
Explore Ohm’s law, equivalent resistance in series and parallel circuits, voltage dividers, electricity consumption costs and RC capacitor transients. Enter circuit values to view calculated results, detailed breakdowns, interactive graphs and simplified circuit diagrams.
| Quantity | Value |
|---|
Table of Contents
Highlights
- Five calculation modes covering common electricity and circuit problems
- Solve Ohm’s law from any two known quantities
- Compare 2–12 resistors in series or parallel
- Interactive graphs, circuit sketches and detailed result tables
- Estimate running costs and explore RC charging or discharging
How Electricity Tool Works?
The electricity calculations cover five related models: steady-state Ohm’s law, resistor networks, an unloaded voltage divider, appliance energy costs and ideal RC transients. Each mode uses its own relevant inputs and reports numerical results alongside a graph and circuit sketch.
Ohm’s law: Supply exactly two known quantities from voltage V, current I, resistance R and power P. The remaining two are obtained from these relationships:
For instance, 12 V and 0.5 A imply 24 Ω resistance and 6 W power.
Resistor networks: Choose series or parallel wiring, enter 2–12 positive resistor values, and specify the supply voltage. Equivalent resistance determines total current and power. The breakdown shows the voltage drop across each series resistor or the current through each parallel branch.
Voltage divider: Enter the supply voltage and positive top and bottom resistors. The output is measured across the bottom resistor, with current and power losses reported.
Electricity cost: Specify appliance power, daily running time, number of days and tariff per kWh. The results include total energy, daily energy, average power, total estimated cost and a 30-day cost estimate. Supported currency labels are USD, GBP, EUR, NZD, AUD, CAD and INR; no exchange-rate calculation is performed.
Here, P is power in watts, h is daily operating hours, d is the number of days, and r is the tariff per kWh.
RC circuit: Choose capacitor charging or discharging and enter voltage, resistance, capacitance and elapsed time. The time constant is the product of resistance and capacitance; the output includes capacitor voltage, current magnitude, charge, stored energy and an approximate five-time-constant transition time.
| Mode | Primary result | Visualisation |
|---|---|---|
| Ohm’s law | Power, voltage, current and resistance | Voltage against current |
| Resistor network | Equivalent resistance | Resistor drops or branch currents |
| Voltage divider | Output voltage | Output against lower resistance |
| Energy | Estimated electricity cost | Cumulative cost against days |
| RC circuit | Capacitor voltage | Voltage against time |
Practical Use Cases
Electronics students: Check the voltage, current, resistance and power relationships in classroom circuit problems, then inspect the voltage–current graph.
Hobbyists and makers: Compare series and parallel arrangements of up to 12 resistors and review individual voltage drops or branch currents before assembling a circuit.
Embedded systems designers: Estimate an unloaded voltage divider output for a sensor signal or reference node and inspect the effect of changing the lower resistor.
Households and tenants: Estimate the cost of operating a heater, computer or other electrical appliance using its rated power, daily runtime, billing period and local electricity tariff.
Technicians and circuit learners: Explore how resistance, capacitance and elapsed time affect charging and discharging behaviour, including time constant, charge and stored energy.
Accuracy and Limitations
Results use standard ideal-circuit equations and browser floating-point arithmetic, with displayed numbers rounded for readability. Ohm’s law assumes an ohmic load; resistor calculations exclude tolerance, temperature and wiring effects. The divider assumes no connected output load. Energy costs use constant rated power and one flat tariff, excluding standing charges, taxes and time-of-use pricing. RC curves assume ideal components and the specified initial conditions, without leakage or parasitic resistance; discharge current is shown as a magnitude. Resistor networks accept 2–12 strictly positive values, daily usage is limited to 24 hours, and unusually small or large inputs may lose numerical precision.
