Ii.put the undertined verbs in the sentences in past perfect tense i ampere determined the difference between the current and the static charges before giving the current direction 2. men of science formed a lot of theories after volta produced a source of continuous current.3. by 1753 franklin made
an important contribution to the science of electricity 4 galvani observed the experiments with the frogs' legs before volta began to carry on similar experiments.5. volta spent several years before he generated a continuous current. напишите глаголы

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