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Solved exercise · level 3 of 5

Line voltage drop: source voltage

Skills: Calculate

Statement

2 bell(s) in parallel each draw 0.25 A at 6 V. They are far from the source: each of the two line conductors has 0.5 Ω. What voltage must the source supply?

n = 2 · Iₙ = 0.25 A · Uₙ = 6 V · Rligne = 0.5 Ω

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

Guided problem in 4 steps: unknown, formula, units, data, result.

1 hint from Bastaya available in the lab
Solution

Total I = 2 × 0.25 = 0.5 A; drop in the two wires = 2 × 0.5 × 0.5 V; U = 6 + drop = 6.5 V.

Course sheet of the chapter : Resistor networks

This chapter is covered by the paths: 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.

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