7 Mike and Oliver investigate the current flowing in different series circuits. (a) Here is series circuit 1. component X clroult 1 Component X measures the current. (i) Name component X. [1] (ii) What is the unit for current? [1] (b) Mike and Oliver move component X to make series circuit 2. component X alroult 2 What happens to the reading of component X in circuit 2 compared to circuit 1? Use ideas about electrons to explain your