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Solved exercise · level 2 of 5

RL time constant

Skills: Know

Statement

A 0.5 H coil in series with 100 Ω: the time constant τ = L / R is...

  1. 5 ms
  2. 50 s
  3. 200 s
  4. 0,5 ms
2 hints from Bastaya available in the lab
Solution

τ = L / R = 0.5 / 100 = 5 ms: the current builds up gradually, 63 % after τ, ≈ 100 % after 5τ.

Course sheet of the chapter : Induction & self-induction

This chapter is covered by the paths: General electricity

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
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fit the board
drag background
pan

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