Calculator · Electrical Engineering
Thévenin & Norton Equivalent Calculator
Seen from two terminals, any linear DC network acts like one source and one resistor. The network below is solved by the same nodal solver as the Lab: open-circuit voltage first, then a test current with the sources removed.
Network
V1 drives node 1; R1 links nodes 1–2, R2 links node 2 to the reference, R3 links nodes 2–3; an optional current source Is1 feeds node 2. Passive sign convention: each element is oriented from → to, v = V(from) − V(to), current is positive from → to, and p = v·i > 0 means the element absorbs power.
Inputs
Results
V_th = V(A) − V(B)
R_th = R_N
| Norton current I_N | 1.8 A |
|---|---|
| Norton resistance R_N | 5 Ω |
| Thévenin polarity | + terminal of V_th toward A |
| Norton direction | I_N leaves A through an external short from A to B (positive value) |
Explore in the Lab
The Lab keeps the same terminals; its Results view shows the same equivalent.
Technical reference
V_th = V(A) − V(B) with the port open
R_th = test voltage / 1 A with independent sources removed
I_N = V_th / R_th, R_N = R_th
- V_th
- Thévenin (open-circuit) voltage[V]
- R_th
- Thévenin resistance[Ω]
- I_N
- Norton (short-circuit) current[A]
Removing sources: voltage sources become shorts, current sources become opens.