<Table> <Tr> <Th> Material </Th> <Th> ρ (Ω m) at 20 ° C </Th> <Th> σ (S / m) at 20 ° C </Th> </Tr> <Tr> <Td> Silver, Ag </Td> <Td> 1.59 × 10 </Td> <Td> 6.30 × 10 </Td> </Tr> <Tr> <Td> Copper, Cu </Td> <Td> 1.68 × 10 </Td> <Td> 5.96 × 10 </Td> </Tr> <Tr> <Td> Aluminum, Al </Td> <Td> 2.82 × 10 </Td> <Td> 3.50 × 10 </Td> </Tr> </Table> <Tr> <Th> Material </Th> <Th> ρ (Ω m) at 20 ° C </Th> <Th> σ (S / m) at 20 ° C </Th> </Tr> <Tr> <Td> Silver, Ag </Td> <Td> 1.59 × 10 </Td> <Td> 6.30 × 10 </Td> </Tr> <Tr> <Td> Copper, Cu </Td> <Td> 1.68 × 10 </Td> <Td> 5.96 × 10 </Td> </Tr>

The difference in charge of a conductor is called