Un transformateur avec une tension primaire de 120 volts fournit 250 watts à un émetteur. En négligeant les pertes, quel est le courant approximatif au primaire?

Why

To find the current flowing into the transformer, you divide the power used by the voltage supplied. The full explanation — and one for every question — is in Pro.

Practise this section

Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.

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