Torpedo battery charger

[Swi1ch]

When I put in a battery to charge, the unit starts whistling quite loudly. Should I be worried?

[Kenneth131]

nope this is normal there is an explanation


"The hum comes about because the transformer works by running the alternating wall current through some loops of wire to make magnetic fields, and running the fields through other loops of wire to reconstitute the electric fields at a different voltage.

A side effect of this is a set of periodically alternating mechanical stresses on the core of the transformer. Stresses mean motion, and alternating motion in the right band means audible vibration in the air.

In short, when the transformer is under load (charging a battery) the metal plates inside the transformer oscillate (vibrate) creating a hum or whine."

Hope this helps.

Thanks
Louise

[Swi1ch]

Thanks.