engleski

A novel approach to determining induced voltage

High school students in Croatia and Slovenia have difficulties with determining induced voltage when wire loops enter or exit magnetic fields. We proposed and tested a new technique for determining induced voltage in wire loops of various shapes. The technique uses a simple tool, accessible to every teacher, made from transparent foil and paper. We implemented a quasi-experimental design (using both pre-test and post-test, without a control group) and tested the new tool and corresponding problem-solving technique on 78 high school students in Croatia who already learned about electromagnetic induction. Students were tested a week before participating in a workshop where they were taught how to determine induced voltage using the tool proposed here. A week after the workshop they were post-tested. We found that 32% of students benefited from the exercise and showed improvement in understanding when and how voltage is induced in wire loops. Tools like this may help students in transition from concrete to formal thinking when solving problems related to more abstract physical phenomena, such as magnetic induction.

physics education; electromagnetic induction

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