Resistors and Capacitors

3 tools

Which Resistors and Capacitors tool do you need?

Tool	What it answers
Resistance Calculator	Resistance equals voltage divided by current, R = V ÷ I.
Resistor Calculator	Read the bands from the end opposite the gold or silver band.
Voltage Divider Calculator	A voltage divider's output is Vout = Vin × R2 ÷ (R1 + R2), where R2 is the resistor between the output tap and ground.

Turn the colour bands on a through-hole resistor into its value in ohms, with the tolerance range. Yellow-violet-red-gold reads 4.7 kΩ ±5%.

Find the output voltage of a two-resistor divider from Vin, R1 and R2, with divider current, resistor power and the sag caused by a resistive load.

Find resistance in ohms from any two of voltage, current and power, with conductance and dissipated power. 120 V and 60 W gives 240 Ω.