Elec Class

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Solved exercise · level 3 of 5

Power from the current amplitude

Skills: Calculate

Statement

What is the power of a resistor working at 230 V and carrying an AC current whose amplitude on the oscilloscope is 4 cm (calibration 1 cm ≙ 0.5 A)?

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

2 hints from Bastaya available in the lab
Solution

Imax = 4 × 0.5 = 2 A; I = Imax / √2 = 1.41 A; P = U · I = 230 × 1.41 = 325 W (pure resistor: cos φ = 1).

Course sheet of the chapter : Alternating current

This chapter is covered by the paths: General electricity, 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.

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