Labo Élec

electrical lab simulator
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Exercise from the chapter "AC power"

Two coils in series

Level 4 of 5 · Skills: Calculate

Statement

A circuit contains two coils in series (R₁ = 25 Ω, L₁ = 0.1 H and R₂ = 15 Ω, L₂ = 0.1 H). What active, reactive and apparent powers does it absorb at 120 V, 50 Hz?

Active power ΣP = ΣR · I².

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

1 hint from Bastaya available in the lab
Solution

ΣR = 40 Ω; ΣL·ω = 62.8 Ω; Z = 74.5 Ω; I = 1.61 A; P = ΣR·I² = 104 W; Q = ΣLω·I² = 163 var; S = √(P² + Q²) = U·I = 193 VA.

Course sheet of the chapter : AC power

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-

Workbench

Circuit diagram CEI 60617

How does it work?

The perfboard: each big hole is a circuit node. You push a single leg of a component (resistor, lamp...) into it. The 4 small holes around it are connected to it: that is where chips and leads plug in.

  1. Drag a component onto the board: it snaps onto the grid. R rotates it.
  2. To join neighbouring big holes, click Jumper chip in the palette (or C) then drag on the board: a line of chips is laid at once. Bridged holes become a single node.
  3. For long links and for the power supply (placed next to the board), drag a lead from one big hole to another (or to a terminal).
  4. As soon as a loop is closed, the circuit is solved in real time (Ohm + Kirchhoff) and the diagram follows.
  5. Zoom with the wheel (or + / −, two-finger pinch); drag the background to pan, 0 fits the board. The + buttons around the board add a row or a column.

Del delete · R rotate · C chip brush · Esc cancel · wheel zoom · drag the background to pan

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