Answer:
Steinmetz' experiments on power losses in the magnetic materials used in electrical machinery led to his first important work, the law of hysteresis. This law deals with the power loss that occurs in all electrical devices when magnetic action is converted to unusable heat.
Explanation:
Property tests, the grandfather clause and literacy tests,
Answer:
the slave codes
Explanation:
The laws that established an official system of slavery in the american colonies were referred to as "Slave Codes" which not only established the status of different slaves but also a good deal of their treatment.
The answer is the second choice
Answer:
Suprime court case affirmed courts power of judicial review by declaring a law made by congress as unconstitutional.
Explanation:
