Electricity and Circuits - SS1 Physics Past Questions and Answers - page 1

Electric charge is a fundamental property of matter. It can be positive or negative, and like charges repel each other while opposite charges attract. A charge is quantized, meaning it exists in discrete units called elementary charges. The SI unit of charge is the Coulomb (C).

Conductors are materials that allow the flow of electric charge easily. They have loosely bound electrons that are free to move within the material. Examples include metals like copper and aluminium. Insulators, on the other hand, do not allow the flow of charge easily. They have tightly bound electrons and do not conduct electricity well. Examples include rubber, glass, and plastic.