THE ground engineer must be familiar with the ordinary sources of electrical energy used on aeroplanes. For the long‐distance distribution of power on a commercial scale, alternating current is fast becoming universal, but in an aeroplane, of course, no such scheme is possible, and the comparatively small amount of electrical energy which is required has either to be taken up in the form of a storage battery, or else generated on the spot by a wind‐driven or engine‐driven D.C. dynamo. On most commercial aeroplanes of any size, a combination of both battery and dynamo will be found, the battery acting as a reservoir of electrical energy which is kept replenished by the dynamo.
Crook, W.E. (1936), "Maintenance of Electrical Equipment: A Complete Guide for Prospective Ground Engineers Studying for an “X” Licence", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 1, pp. 7-9. https://doi.org/10.1108/eb030003
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