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Solved exercise · level 1 of 5

Ohmmeter rule

Skills: Know

Statement

Before measuring a resistance with an ohmmeter in a circuit, you must...

  1. Switch off the circuit supply
  2. Set the supply to maximum
  3. Connect the ohmmeter in series
  4. Choose the ampere range
2 hints from Bastaya available in the lab
Solution

The ohmmeter injects its own current: on a live circuit the reading is wrong and the instrument may be damaged.

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-

Circuit diagram CEI 60617

How does it work?

Each big hole is a circuit node: you push one leg of a component into it. The 4 small holes around it are connected to it: chips and leads plug in there.

  1. Place a component Drag it from the palette: it snaps onto the grid. R rotates it.
  2. Bridge neighbouring holes Pick the jumper chip (or C) and drag on the board: bridged holes become a single node.
  3. Draw a lead For long links and the power supply: from one big hole to another, or to a terminal.
  4. Close the loop The circuit is solved live (Ohm, Kirchhoff) and the diagram follows.

Shortcuts

Del
delete
R
rotate
C
chip brush
Esc
cancel
wheel
zoom
0
fit the board
drag background
pan

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