Labo Élec

electrical lab simulator
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Exercise from the chapter "Measurement & instruments"

Measuring a resistance with an ohmmeter

Level 2 of 5 · Skills: Measure

Statement

R1 and R2 are in series, with no source. Connect an ohmmeter between the left leg of R1 (A4) and the right leg of R2 (F4), read the measured resistance and enter it.

Parametric exercise: the values change with every draw; these are one example.

3 hints from Bastaya available in the lab
Solution

Resistors in series: the ohmmeter reads R1 + R2 = 390 + 100 = 490 Ω. It injects a small test current: the circuit must be de-energised.

Course sheet of the chapter : Measurement & instruments

This chapter is covered by the paths: General electricity, Measurement prep

Other exercises of the chapter

Simulated time00:00:00
Q = I·t-
W = P·t-

Workbench

Circuit diagram CEI 60617

How does it work?

The perfboard: each big hole is a circuit node. You push a single leg of a component (resistor, lamp...) into it. The 4 small holes around it are connected to it: that is where chips and leads plug in.

  1. Drag a component onto the board: it snaps onto the grid. R rotates it.
  2. To join neighbouring big holes, click Jumper chip in the palette (or C) then drag on the board: a line of chips is laid at once. Bridged holes become a single node.
  3. For long links and for the power supply (placed next to the board), drag a lead from one big hole to another (or to a terminal).
  4. As soon as a loop is closed, the circuit is solved in real time (Ohm + Kirchhoff) and the diagram follows.
  5. Zoom with the wheel (or + / −, two-finger pinch); drag the background to pan, 0 fits the board. The + buttons around the board add a row or a column.

Del delete · R rotate · C chip brush · Esc cancel · wheel zoom · drag the background to pan

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