Elec Class

learn electricity hands-on
0 1 / 20

Solved exercise · level 2 of 5

Time constant

Skills: Know

Statement

A 100 µF capacitor charges through a 10 kΩ resistor. Its time constant τ = R·C is...

  1. 1 s
  2. 1 ms
  3. 10 s
  4. 100 ms
2 hints from Bastaya available in the lab
Solution

τ = R × C = 10⁴ × 10⁻⁴ = 1 s. After τ the voltage reaches 63 % of its final value; after 5τ the charge is considered complete.

Course sheet of the chapter : Capacitors

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
zoom
0
fit the board
drag background
pan

Confirmer

Renommer

Importer un montage

Export