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Solved exercise · level 3 of 5

Loop equation

Skills: Know

Statement

A loop contains a generator E, then R₁ and R₂ in series, carrying I in the direction of E. Which loop equation is correct?

  1. E − R₁·I − R₂·I = 0
  2. E + R₁·I + R₂·I = 0
  3. E − R₁·I + R₂·I = 0
  4. E · I = R₁ + R₂
2 hints from Bastaya available in the lab
Solution

Loop rule: the algebraic sum of voltages around a loop is zero; E counts +, the drops R·I in the current direction count −.

Course sheet of the chapter : Kirchhoff's laws

This chapter is covered by the paths: General electricity, Measurement prep

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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