Litmux Studio

LabReal resistors: values, codes and tolerance · 15 min

Lab: combining resistors with the ohmmeter

Three loose resistors and the multimeter on Ω. Measure one, then build parallel and series combinations and check the rules - and make a value that is not on any shelf.

The circuit for: Lab: combining resistors with the ohmmeter
The circuit you start with

The steps

  1. Press RUN (the ohmmeter needs the simulation running - nothing here is powered: the meter supplies its own small current).RUN is on the toolbar (F5).
  2. Place the multimeter, turn the dial to Ω, and measure R1: red (VΩ) on its left end, black (COM) on its right end. 1.000 kΩ.Resistance: across the part, out of any circuit.
  3. Wire R2 in parallel with R1: R2's left end to R1's left end, R2's right end to R1's right end. Two equal resistors in parallel: 500 Ω.Use the Wire tool (W): two short vertical wires.
  4. Now add R3 in series: wire R3's left end to R1's right end, and move the black lead to R3's right end. 500 Ω + 2.2 kΩ = 2.70 kΩ.Delete the black lead wire, then wire COM to R3's right end.
  5. You need exactly 2.5 kΩ, which is in no E12 drawer. Change R3 to 2k (an E24 value): 2 k + 1 k ∥ 1 k = 2.50 kΩ.Double-click R3 and type 2k.

What it shows