Elec Class

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Solved exercise · level 1 of 5

Doubling the cross-section

Skills: Know

Statement

If the cross-section of a wire is doubled without changing its length, its resistance...

  1. Is halved
  2. Doubles
  3. Does not change
  4. Is divided by 4
2 hints from Bastaya available in the lab
Solution

R = ρ·l/S: R is inversely proportional to the cross-section.

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

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

Del
delete
R
rotate
C
chip brush
Esc
cancel
wheel
zoom
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fit the board
drag background
pan

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