SignalPrep
Advanced Qualification · A-003 Measurements · A-003-002-004

Pour calculer la puissance de sortie d'un émetteur débitant dans une charge résistive lorsqu'on dispose d'un voltmètre, on emploie la formule :

  1. AP = EI/R
  2. BP = EI cos 0
  3. CP = IR
  4. DP = (E exposant 2) / R

Correct answer: D — P = (E exposant 2) / R. Question tirée de la banque officielle d'ISDE.

Why

To find power when you only know voltage and resistance, you must square the voltage reading and divide it by the resistance value. The full explanation — and one for every question — is in Pro.

Practise this section

Measurements is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.

Drill A-003 — free, no account

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