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Solved exercise · level 2 of 5

Measuring a resistance with an ohmmeter

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-

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
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fit the board
drag background
pan

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