Elec Class

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Solved exercise · level 3 of 5

Which metal? (voltmeter-ammeter method)

Skills: Measure, Calculate

Statement

Wire F1 is 100 m long with a diameter of 1.6 mm, but its material is unknown. V1 and A1 measure its voltage and current.

Compute its resistance R = U / I.

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

2 hints from Bastaya available in the lab
Solution

R = U/I = 24.9 Ω; ρ = R·S/l = 24.9 × 2.01 / 100 ≈ 0.5 Ω·mm²/m: it is constantan.

Course sheet of the chapter : Ohm's law & resistance

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.

Shortcuts

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R
rotate
C
chip brush
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drag background
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