An electric current is established in a copper wire when it is connected to a battery. Which of the following statements about the charge carriers responsible for this current is correct?
The current is caused by the flow of positively charged protons.
The current is caused by the flow of negatively charged electrons.
The current is caused by the flow of neutral neutrons.
The current is caused by the flow of both positive protons and negative electrons in opposite directions.
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.