# Electronics & Power — CapyToolkit Blog

For the full blog, see: [Blog](https://capytoolkit.com/blog/)

[Power Bank and GaN Charger Capacity Claims: How to Verify the mAh-to-Wh Math Yourself](https://capytoolkit.com/blog/electronics-power/power-bank-charger-capacity-claims-verify-mah-wh-math-yourself/): Battery listings show mAh, not watt-hours. Convert them, test the claim against weight and delivered energy, and choose a power bank that delivers.
[Verifying LED Panel Driver Failures Before Desoldering: What Ohm's Law Covers That a Visual Inspection Misses](https://capytoolkit.com/blog/electronics-power/led-panel-driver-failures-verify-ohms-law-before-desoldering/): Measure power-rail voltage, decode resistor markings, and compute expected dissipation to decide if your LED driver is worth repairing before desoldering.
[Portable Power Station Claims Don't Add Up: How to Check the Math Yourself](https://capytoolkit.com/blog/electronics-power/portable-power-station-claims-dont-add-up-check-math-yourself/): Marketing specs obscure the real runtime. Use Ohm's Law and free browser math tools to verify power station capacity before you buy.
[Ohm's Law: Solving for Voltage, Current, and Resistance Without a Scientific Calculator](https://capytoolkit.com/blog/electronics-power/ohms-law-solve-voltage-current-resistance-online/): Master Ohm's Law and Watt's Law so you can solve any circuit equation by hand and know when to reach for a calculator.
[Offline Resistor Code Decoding for Automotive Electronics Troubleshooting](https://capytoolkit.com/blog/electronics-power/offline-resistor-code-decoding-automotive-electronics-troubleshooting/): Decode 4/5/6-band resistors offline for automotive ECU repairs. Avoid cloud tools, protect proprietary schematics, and fix heat-damaged components fast.
[Troubleshooting Guitar Amplifiers with CapyToolkit's Client-Side Resistor Calculator](https://capytoolkit.com/blog/electronics-power/troubleshooting-guitar-amplifiers-resistor-calculator/): Repair vintage guitar amps by decoding resistor values offline. Systematic troubleshooting for bias, preamp, and power stages.
[Decoding 6-Band Resistor Codes for Precision Electronics Prototyping](https://capytoolkit.com/blog/electronics-power/decoding-6-band-resistor-codes-for-precision-electronics-prototyping/): Learn to decode 6-band resistor color codes for precision electronics prototyping using a client-side, zero-cloud calculator.
[Field-Ready Engineering Calculations: Offline Unit Conversion for Renewable Energy Projects](https://capytoolkit.com/blog/electronics-power/engineering-calculations-offline-renewable-energy/): Offline unit conversion for solar and battery projects. Learn essential conversions and avoid common errors.
[Electrical Unit Conversions for Renewable Energy Systems: Sizing Solar and Battery Installations](https://capytoolkit.com/blog/electronics-power/electrical-unit-conversions-renewable-energy-solar-battery/): Convert solar panel specs and battery capacities correctly for reliable off-grid power systems using CapyToolkit.
[Resistor Colour Code Calculator for Quick Offline Circuit Design](https://capytoolkit.com/blog/electronics-power/resistor-colour-code-calculator-for-quick-offline-circuit-design/): Learn to decode resistor colour bands offline with CapyToolkit's browser-based calculator for fast prototyping and field repairs.