In this physics lesson, students explored the topic of electricity, focusing specifically on alternating current (AC) and circuit diagrams. They reviewed a past exam question from May 2014 related to a power station generating AC at 50 Hz, which changes direction 50 times per second. The session also included constructing a circuit diagram featuring a 9-volt battery connected to resistors in series and parallel, and students learned to calculate total resistance using the appropriate formulas. Understanding the connections and characteristics of AC and circuit components was emphasized throughout the lesson.