PangPang ToolsInput voltage (V): 12, Upper resistor (Ω): 1000, Lower resistor (Ω): 2000
Divider output: 8 VUsing these sample input values gives the first labelled output above. No-load DC divider; attached load changes the output voltage.
Construction & Electrical
DC Resistor Voltage Divider
About this tool
DC Resistor Voltage Divider performs a browser-local calculation using measurements and quantities you control. The results are presented as labelled figures so each number is easy to interpret. No-load DC divider; attached load changes the output voltage.
Resistors & LED circuits
Choose a task. Inputs stay in this page only.
MAKE IT SIMPLE
Result
Worked examples
Questions & answers
Can I use the default numbers for purchasing or safety certification?
No. Replace the examples with your real values. No-load DC divider; attached load changes the output voltage.
MAKE IT SIMPLE
Result
Worked examples
R1 resistance (Ω): 100, R2 resistance (Ω): 200
Series resistance: 300 ΩUsing these sample input values gives the first labelled output above. Ideal resistors; tolerance, thermal limits and frequency response are not included.
Questions & answers
Can I use the default numbers for purchasing or safety certification?
No. Replace the examples with your real values. Ideal resistors; tolerance, thermal limits and frequency response are not included.
MAKE IT SIMPLE
Result
Worked examples
Supply 12 V; three LEDs at 2 V each; target current 20 mA
Resistor drop 6 V; resistance 300 Ω; dissipation 0.12 WThe LED string drops 3 × 2 = 6 V, leaving 6 V for the resistor. At 0.02 A, 6 ÷ 0.02 = 300 Ω.
Supply 9 V; two LEDs at 2 V each; target current 10 mA
Resistor drop 5 V; resistance 500 Ω; dissipation 0.05 W9 − 4 = 5 V across the resistor; 5 ÷ 0.01 = 500 Ω and 5 × 0.01 = 0.05 W.
Questions & answers
Is calculated dissipation the same as the resistor's required rating?
No. It is the expected operating heat dissipation under the entered assumptions. Select a resistor rated above it, allowing for ambient temperature and tolerances.
Can I use this for an AC mains lamp or a high-power LED?
No. Mains circuits need an appropriately certified driver and electrical safety design; high-power LEDs often require regulated constant-current drivers.