Electrical

Design a matched Pi or T attenuator from target loss and impedance, then audit preferred resistor values, input match and power rating.

Estimate battery charge time across a chosen state-of-charge window using charger limits, efficiency and taper plus realistic derating and overhead.

Check conductor area against conduit fill limits for EMT, IMC, RMC, or PVC, then find the first same-type trade size that fits.

Calculate half-wave dipole total and per-leg cut lengths from frequency, shortening factor, and trim allowance with practical tuning guidance.

Size an EV charger circuit from EVSE current and check breaker fit, panel capacity plus conductor ampacity and long-run voltage drop.

Estimate EV charging time from battery and power limits with taper and losses, then check added range, session cost and departure fit.

Calculate NEC-style box fill from conductors and fittings, then compare required volume with the marked box capacity and available margin.

Estimate dwelling electrical service demand from general and major loads, then compare the result with the entered rating and headroom target.

Estimate extension-cord voltage drop and load voltage from copper AWG, length, and current with checks for heat loss and safe run length.

Size generator running and starting wattage from a load inventory, with startup overlap and site-derating assumptions for equipment comparison.

Estimate greenhouse lamp runtime from daily light targets, with fixture sizing and energy use that account for sunlight and allowed hours.

Size or check a heat sink from power, ambient and junction limits using the full thermal-resistance path plus airflow planning factors.

Estimate a home EV charger installation budget from circuit size and wire route with panel work, labor, permits and uncertainty included.

Practice recognizing U.S. home electrical hazards with 24 scenarios and explanations of safer choices and when to seek qualified help.

Estimate IIP3 and OIP3 with IM3 clearance and SFDR for an equal-tone RF test based on gain, noise bandwidth and detection margin.

Calculate ideal series RLC impedance from reactances or component values with phase, power factor, current and resonance results.

Estimate annual LED energy and bill savings from your lighting schedule, then compare upgrade cost, simple payback and long-term net benefit.

Estimate PCB microstrip impedance or solve finished trace width from stackup geometry, compare IPC-2141 and Hammerstad-Jensen, and test tolerance.

Calculate cascaded RF noise figure and receiver sensitivity from ordered gain and loss stages plus bandwidth, temperature and SNR.

Calculate closed-loop op-amp gain or solve a resistor value and check output swing against speed limits and resistor tolerance under the entered load.

Plan a PoE switch from endpoint demand and cable loss, then check reserve capacity against powered ports, startup surge and shedding priority.

Calculate power factor from kW and kVA, size leading or lagging reactive correction, and estimate per-phase capacitance when voltage is known.

Plan rack power density from device loads and feed limits, with failover headroom, heat output, occupancy, and watts-per-U guidance.

Decode resistor colors for 4- to 6-band parts and get resistance, tolerance limits, reading direction plus first-order temperature drift.

Find practical resistor networks for a target value, rank nominal error, and screen stock tolerance and per-part power stress before building.

Analyze Sallen-Key low-pass, high-pass, or band-pass stages from real R/C values with f0, Q, GBW headroom, tolerances, and response checks.

Plan a shop lighting grid from room size and work-plane lux with fixture counts and spacing checks that allow for losses and energy use.

Estimate solar module count and DC array size from electricity use, sun hours, losses, available area, and optional inverter sizing.

Turn strict WaveJSON into a browser-rendered timing diagram with bounded lane validation, source-order review, and SVG or image output.

Calculate transformer turns and full-load current from RMS voltage and VA inputs, with impedance-ratio checks plus single- or three-phase review.

Estimate UPS runtime from real load and battery energy while applying efficiency and health factors, reserve, watt and VA limits and shutdown margin.

Convert VSWR or return loss into exact RF mismatch values and power splits with support for reflection coefficient, reflected watts and review guidance.

Size or analyze a loaded voltage divider and check preferred resistor values, output sag plus tolerance, current and power before building.

Size an AWG conductor with voltage-drop and ampacity checks using current, run length, material and a temperature reference column.