Labo Élec

electrical lab simulator
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Measurement prep

4 steps

Connecting and reading the instruments, to prepare lab sessions.

Connecting instruments

Step 1

Voltmeter in parallel, ammeter in series, potentiometer, classic mistakes. Reminder · Measurement & instruments

  1. The voltmeter level 2
  2. Voltmeter on R2 level 2
  3. Ammeter in series level 2
  4. Measure, then conclude level 3
  5. Connecting a voltmeter level 1
  6. Connecting an ammeter level 1

Reading and choosing

Step 2

Ranges, needle dials, ohmmeter, wattmeter, internal resistance of meters, shunt. Reminder · Measurement & instruments

  1. Reading a needle voltmeter level 2
  2. Reading a needle ammeter level 2
  3. Choosing the range level 1
  4. Range and needle level 2
  5. Ohmmeter rule level 1
  6. Measuring a resistance with an ohmmeter level 2
  7. Reading a wattmeter level 2
  8. Not-so-perfect voltmeter level 4
  9. Upstream or downstream connection level 3
  10. Shunt calculation level 4

Real generators

Step 3

E, r, E', r' and plotting the U = f(I) characteristic. Reminder · Real generators & loads

  1. Generator in opposition level 1
  2. Real generator level 1
  3. EMF of an accumulator cell level 2
  4. Current delivered by an accumulator level 2
  5. External resistance of an accumulator level 2
  6. Predict the current of a real cell level 2
  7. Voltage needed to recharge an accumulator level 2
  8. Maximum charging current level 2
  9. EMF of a charging accumulator level 2
  10. A cell and its load level 2
  11. Internal resistance of an accumulator level 3
  12. Ammeter connected straight across a cell level 3
  13. Electrical efficiency of a generator level 3
  14. Measure the internal resistance of a cell level 3
  15. No load, then under load level 3
  16. Internal resistance of a charging accumulator level 3
  17. Battery of n cells being charged level 3
  18. Useful power of a motor level 3
  19. Predict the current of a motor level 3
  20. Measure the back-EMF of a motor level 3
  21. Get the wanted current in a motor level 3
  22. Accumulator being charged level 3
  23. Two accumulators in opposition level 3
  24. Limiting the charging current level 3
  25. Rheostat between a generator and a load level 3
  26. Two cells in opposition level 3
  27. Current drawn by a motor level 3
  28. Generalised Ohm's law level 3
  29. Active load level 3
  30. Voltage under load level 3
  31. Load for a given efficiency level 4
  32. Generalised Ohm's law: missing EMF level 4
  33. Two cells, one motor, two resistors level 4
  34. Set the rheostat of a motor level 4
  35. Plotting U = f(I) level 4
  36. Internal resistance from the slope level 4

Kirchhoff's laws

Step 4

Junctions, loops, several sources, Wheatstone bridge. Reminder · Kirchhoff's laws

  1. Junction rule level 1
  2. Current at the junction level 2
  3. Two cells in series level 2
  4. Missing current level 2
  5. Which branch carries the most current? level 3
  6. Junction law in the lab level 3
  7. Cells in opposition level 3
  8. Loop equation level 3
  9. Two sources, three branches level 4
  10. Two sources on one load level 4
  11. Two-source ladder level 5
  12. Reproduce a bridge level 5
Start this course

All paths · All sheets

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

Confirmer

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