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Solved exercise · level 4 of 5

Mixed network

Skills: Calculate

Statement

R1 = 220 Ω is in series with the group R2 = 330 Ω ∥ R3 = 1000 Ω; the whole is supplied at 12 V. Compute the total current drawn from the source.

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

Guided problem in 3 steps: unknown, formula, units, data, result.

1 hint from Bastaya available in the lab
Solution

R23 = 330 × 1000 / (330 + 1000); Req = 220 + R23 = 468 Ω; I = 12 / Req = 25.6 mA.

Course sheet of the chapter : Resistor networks

This chapter is covered by the paths: 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.

Shortcuts

Del
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R
rotate
C
chip brush
Esc
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drag background
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