Calculator · Electrical Engineering
Voltage Divider Calculator
Two resistors in series across a source split its voltage in proportion to their resistances. The output is taken across the resistor you choose, with no load connected.
Inputs
Results
V_out across R2
4 V
| Divider current I | 4 mA |
|---|---|
| Drop across R1 | 8 V |
| Drop across R2 | 4 V |
| Power in R1 | 32 mW |
| Power in R2 | 16 mW |
| Source delivers | 48 mW |
Assumptions
- · unloaded divider (no current drawn at the output)
Explore in the Lab
Open this divider in the Electrical Networks Lab
Same circuit, solved by the same network solver; the output resistor becomes the Thévenin terminals.
Technical reference
I = V_in/(R1 + R2)
V_R2 = V_in·R2/(R1 + R2), V_R1 = V_in·R1/(R1 + R2)
p_k = I²·R_k
- V_in
- source voltage[V]
- R1, R2
- series resistors (> 0)[Ω]
Unloaded: any load across the output is in parallel with that resistor and lowers V_out.