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Solved exercise · level 3 of 5

Accumulator being charged

Skills: Analyse

Statement

Accumulator E2 (e = 12 V, r = 0.2 Ω) is connected in opposition to G (12.8 V) to be recharged: G's + on E2's +. What charging current will A1 show?

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

2 hints from Bastaya available in the lab
Solution

I = (U − e) / r = (12.8 − 12) / 0.2 = 4 A; the power e·I is stored, r·I² is lost as heat; η = e / U = 0.938.

Course sheet of the chapter : Real generators & loads

This chapter is covered by the paths: General electricity, Measurement prep, ISL-oriented exercises

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

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R
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C
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