https://learn.pablochtech.com/blog/Free electronics guides and calculatorsen https://learn.pablochtech.com/blog/ac-vs-dc/https://learn.pablochtech.com/blog/ac-vs-dc/Fri, 06 Nov 2026 00:00:00 +0000CircuitsAC vs DC in plain English: what each one is, 50 Hz vs 60 Hz, why homes use AC and phones use DC, and how a diode bridge turns AC into DC. https://learn.pablochtech.com/blog/appliance-power-consumption-chart/https://learn.pablochtech.com/blog/appliance-power-consumption-chart/Fri, 06 Nov 2026 00:00:00 +0000Home energyHow many watts does an AC, fridge, TV, fan, laptop or water heater use? A clear wattage chart with real kWh per month for 30+ home appliances. https://learn.pablochtech.com/blog/binary-to-hex-conversion/https://learn.pablochtech.com/blog/binary-to-hex-conversion/Fri, 06 Nov 2026 00:00:00 +0000Digital & ArduinoConvert binary to decimal and hex in seconds: place values, the nibble trick, a 0–F table and examples like 0x20 = 32. Free bit flipper. https://learn.pablochtech.com/blog/how-to-calculate-electricity-bill/https://learn.pablochtech.com/blog/how-to-calculate-electricity-bill/Fri, 06 Nov 2026 00:00:00 +0000Home energyCalculate your electricity bill from watts, hours and price per kWh. Simple formula, worked examples for AC, fridge, heater and TV, plus a free calculator. https://learn.pablochtech.com/blog/how-to-use-a-multimeter/https://learn.pablochtech.com/blog/how-to-use-a-multimeter/Fri, 06 Nov 2026 00:00:00 +0000ToolsLearn to use a multimeter step by step: every dial symbol, which hole each probe goes in, and how to measure volts, ohms, continuity and amps safely. https://learn.pablochtech.com/blog/inverter-battery-backup-time/https://learn.pablochtech.com/blog/inverter-battery-backup-time/Fri, 06 Nov 2026 00:00:00 +0000Batteries & powerHow long will your inverter battery last? Backup time formula (V × Ah × efficiency ÷ load), 150 Ah and 200 Ah examples, and a free calculator. https://learn.pablochtech.com/blog/led-resistor-calculator/https://learn.pablochtech.com/blog/led-resistor-calculator/Fri, 06 Nov 2026 00:00:00 +0000ComponentsFind the right LED resistor with R = (Vs − Vf) ÷ I. Ready values for 3.3 V, 5 V, 9 V and 12 V, resistor wattage, and a free LED resistor calculator. https://learn.pablochtech.com/blog/logic-gates-truth-tables/https://learn.pablochtech.com/blog/logic-gates-truth-tables/Fri, 06 Nov 2026 00:00:00 +0000Digital & ArduinoThe 7 basic logic gates — AND, OR, NOT, NAND, NOR, XOR, XNOR — with truth tables, everyday examples and a free logic gate simulator. https://learn.pablochtech.com/blog/mah-to-wh-power-bank/https://learn.pablochtech.com/blog/mah-to-wh-power-bank/Fri, 06 Nov 2026 00:00:00 +0000Batteries & powerConvert mAh to Wh and see how many times a 10,000 or 20,000 mAh power bank really charges your phone. Formula, losses, airline rule, free calculator. https://learn.pablochtech.com/blog/ohms-law-explained/https://learn.pablochtech.com/blog/ohms-law-explained/Fri, 06 Nov 2026 00:00:00 +0000CircuitsOhm's law in plain English: V = I × R, the triangle trick, power P = V × I, and real examples with LEDs, chargers and heaters. Free calculator. https://learn.pablochtech.com/blog/pwm-explained/https://learn.pablochtech.com/blog/pwm-explained/Fri, 06 Nov 2026 00:00:00 +0000Digital & ArduinoWhat PWM is, how duty cycle sets the average voltage, and how Arduino analogWrite (0–255) dims LEDs and controls motors. PWM pins, frequency, simulator. https://learn.pablochtech.com/blog/rc-time-constant/https://learn.pablochtech.com/blog/rc-time-constant/Fri, 06 Nov 2026 00:00:00 +0000Circuitsτ = R × C tells you how fast a capacitor charges: 63 % after 1 τ, over 99 % after 5 τ. Worked examples, the charging curve, uses and a free simulator. https://learn.pablochtech.com/blog/resistor-color-code-chart/https://learn.pablochtech.com/blog/resistor-color-code-chart/Fri, 06 Nov 2026 00:00:00 +0000ComponentsRead any resistor in seconds: color code chart for 4-band and 5-band resistors, digits, multiplier, tolerance, worked examples and a free decoder. https://learn.pablochtech.com/blog/series-and-parallel-resistors/https://learn.pablochtech.com/blog/series-and-parallel-resistors/Fri, 06 Nov 2026 00:00:00 +0000CircuitsResistors in series add up; in parallel the total gets smaller. Formulas, the two-resistor shortcut, worked examples and a free calculator. https://learn.pablochtech.com/blog/voltage-divider-calculator/https://learn.pablochtech.com/blog/voltage-divider-calculator/Fri, 06 Nov 2026 00:00:00 +0000CircuitsVoltage divider formula Vout = Vin × R2 ÷ (R1 + R2), resistor pairs for 5 V to 3.3 V, sensors like LDRs, and a free calculator.