perbedaan, a / an, dan the :

a / an digunakan, jika kita ingin menyatakan sesuatu yang bersifat umum atau tidak spesifik (indefinite)

sedangkan, the digunakan jika kita ingin menyatakan sesuatu yang spesifik (definite)

jawab :

a dynamo is an electrical generator that

produces direct current with the use of a

commutator. (without any article)dynamos

were the first electrical generators capable

of delivering power for industry, and a

foundation upon which many other later

electric-power conversion devices were

based, including the electric motor, the

alternating-current alternator, and the rotary

converter. today (without any article),

simpler alternator dominates large scale

power generator, for efficiency, reliability,

and cost reasons.