Which of the following constitutes the flow of charge (electric current) through an aqueous electrolyte, such as a salt solution?
a flow of free-moving electrons
a flow of mobile positive and negative ions
a flow of protons
a flow of neutral molecules
51 exam-style questions on CIE IGCSE Physics 4.2.2a Electric current, charge and measuring current. Each one has a worked solution and a mark scheme showing where the marks go.