LED Parallel Calculator – Parallel Strings Resistor, Total Current & Efficiency Home›Electronics Calculators›LED Calculators›LED Parallel Calculator This calculator requires JavaScript. Key formula:R = (Vs − n × Vf) / I… read more
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LED Series Calculator
LED Series Calculator – Series String Resistor, Max LEDs & Efficiency Home›Electronics Calculators›LED Calculators›LED Series Calculator This calculator requires JavaScript. Key formula:R = (Vs − n × Vf) / I… read more
Resistor Power Dissipation Calculator
Resistor Power Dissipation Calculator – Power Rating & Derating Check Home›Electronics Calculators›Resistors›Resistor Power Dissipation Calculator This calculator requires JavaScript. Key formulas:P = V²/R | P = I²R | P =… read more
SMD Resistor Code Calculator
SMD Resistor Code Calculator – Decode 3-Digit, 4-Digit & EIA-96 Markings Home›Electronics Calculators›Resistors›SMD Resistor Code Calculator This calculator requires JavaScript. Example: SMD code 472 = 4700Ω = 4.7kΩ Decode or… read more
Pull-Down Resistor Calculator
Pull-Down Resistor Calculator – Sizing, Logic Levels & Standard Values Home›Electronics Calculators›Resistors›Pull-Down Resistor Calculator This calculator requires JavaScript. Key formula:Rpd = VIL × Rdrv / (Vcc − VIL) Hold a… read more
Electrical Efficiency Calculator
Electrical Efficiency Calculator – Input, Output & Power Loss Home›Electronics Calculators›Core Electrical›Electrical Efficiency Calculator This calculator requires JavaScript. Key formula:η = Pout / Pin η = Pout / Pin —… read more
Power Triangle Calculator
Power Triangle Calculator – Real, Reactive & Apparent Power Home›Electronics Calculators›Core Electrical›Power Triangle Calculator This calculator requires JavaScript. Key formula:S² = P² + Q² Real, Reactive & Apparent Power P… read more
Electrical Energy Calculator
Electrical Energy Calculator – Joules, kWh & Electricity Cost Home›Electronics Calculators›Core Electrical›Electrical Energy Calculator This calculator requires JavaScript. Key formula:E = P × t E = P × t —… read more
Zener Diode Resistor Calculator
Zener Diode Resistor Calculator Home›Electronics Calculators›Voltage Dividers›Zener Diode Resistor Calculator This calculator requires JavaScript. Key formula:R = (V_in – V_z) / I_z Find the Series Resistor for Your Zener Diode… read more
Voltage Divider with Zener Calculator
Voltage Divider with Zener Calculator Home›Electronics Calculators›Voltage Dividers›Voltage Divider with Zener Calculator This calculator requires JavaScript. Key formula:R = (V_in – V_z) / (I_z + I_load) Size the Series Resistor… read more
LED Driver Calculator
LED Driver Calculator Home›Electronics Calculators›LED Calculators›LED Driver Calculator This calculator requires JavaScript. Key formulas:P_out = V_out × I_out | P_in = P_out / Efficiency Size a Constant-Current LED Driver 12V… read more