Labo Élec

electrical lab simulator
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Exercise from the chapter "Resistor networks"

Wrong value

Level 3 of 5 · Skills: Build, Analyse

Statement

The target diagram says 18.5 mA at 12 V, but the circuit only draws 4.6.

One resistor has the wrong value. Find it and fix it (R2 is unlocked).

3 hints from Bastaya available in the lab
Solution

With R2 = 2.2 kΩ, Req = 2 630 Ω and I = 4.6 mA. With 220 Ω, Req = 650 Ω and I = 18.5 mA.

Course sheet of the chapter : Resistor networks

This chapter is covered by the paths: Discovery, General electricity

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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