Chapter 19 Electric Charge and Electric Field 5. Conductors and Insulators(p458) Conductors are materials in which some of negative charge can move freel nonconductors (insulators) semiconductors, superconductors 6. The methods to get electric charges p459-460 1) Charged due to rubbing(摩擦起电) 电荷从一个物体,转移到另一个物体。Chapter 19 Electric Charge and Electric Field Conductors are materials in which some of negative charge can move freely. 5. Conductors and Insulators(p458) nonconductors（insulators）， semiconductors， superconductors 6. The methods to get electric charges p459-460 电荷从一个物体，转移到另一个物体。 1) Charged due to rubbing (摩擦起电)