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Solved exercise · level 3 of 5

Wrong value

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-

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.

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