<Li> Ohm's law </Li> <Tr> <Td> Covariant formulation (show) <Ul> <Li> Electromagnetic tensor (stress--energy tensor) </Li> </Ul> <Ul> <Li> Four - current </Li> <Li> Electromagnetic four - potential </Li> </Ul> </Td> </Tr> <Ul> <Li> Electromagnetic tensor (stress--energy tensor) </Li> </Ul> <Li> Electromagnetic tensor (stress--energy tensor) </Li>

Who invented electricity and when was it invented