Labo Élec

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Exercise from the chapter "Kirchhoff's laws"

Two sources on one load

Level 4 of 5 · Skills: Analyse

Statement

Two generators (E1 = 9 V with R1 = 1 Ω, E2 = 6 V with R2 = 1 Ω) supply load R3 = 4 Ω in parallel.

Write Kirchhoff's laws (two loops, one junction) and compute the current in R3.

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

3 hints from Bastaya available in the lab
Solution

U3 = (E1/R1 + E2/R2) / (1/R1 + 1/R2 + 1/R3) = 6.67 V; I3 = U3 / R3 = 1.67 A; I1 = 2.33 A, I2 = 667 mA.

Course sheet of the chapter : Kirchhoff's laws

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-

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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