Exploration of the Demonstration Device for Ohm’s Law of Closed Circuits

In the experiment to explore Ohm’s law of closed circuits, the traditional method is to use an adjustable internal resistance battery, a sliding rheostat and other electrical instruments to form a closed circuit. This circuit can measure the internal voltage and terminal voltage in the circuit. However, this experiment is prone to large experimental errors, and the experimental process is relatively complex. More importantly, it is not easy to succeed. Such an experiment is not conducive to students’ mastery of this experiment. This paper uses common items in life to innovatively design the traditional experiment. Similarly, the experiment can directly measure the terminal voltage and internal voltage in the circuit, so as to optimize teaching and break through the difficulties of this lesson. Compared with the traditional experimental method, the raw materials for this experiment tend to be from daily life, and students can feel that physics is everywhere in life from this experiment.