During a diagnostic test, a medical sensor registers a steady current of 4.8 μA4.8\ \mu\text{A}4.8 μA flowing through a microfluidic channel.
How many electrons pass a given point in the channel during a 2.5-minute2.5\text{-minute}2.5-minute measurement period? (The elementary charge e=1.6×10−19 Ce = 1.6 \times 10^{-19}\text{ C}e=1.6×10−19 C)
7.5×10137.5 \times 10^{13}7.5×1013
4.5×10154.5 \times 10^{15}4.5×1015
7.5×10157.5 \times 10^{15}7.5×1015
4.5×10184.5 \times 10^{18}4.5×1018
37 exam-style questions on AQA A Level Physics Current electricity, covering Basics of electricity, Current-voltage characteristics, Resistivity, Circuits, Potential divider, and Electromotive force and internal resistance. Each one has a worked solution and a mark scheme showing where the marks go.