4. Обусловьте время и залог сказуемого1. The electric motor was invented

1. The electric motor was invented by B. S. Jakob in 1834.- Past Simple Passive Voice.
2. Any instrument which measures electrical values is called a meter.- Present Simple Active Voice, Present Simple Passive Voice.
3. An ammeter measures the current in amperes. - Present Simple Active Voice.
4. The unit is named after Andre Marie Ampere, a French scientist, who discovered a great number of facts about electricity over a hundred years ago. - Present Simple Passive Voice, Past Simple Active Voice.