To begin, the teacher introduced how the motor works based on magnetic theory, and students identified how to utilize motors in many technologies and the benefits and problems of electrical and gasoline cars. Furthermore, students were provided limited money to buy parts for the motor: three wires with different diameters, a volt meter, and ampere meter.
Students measured the current and voltage of each battery (alkaline and Ni-MH batteries) and the different diameters of wire (0.32mm, 0.4mm, and 0.5mm). This activity is a type of scaffold instruction. The reasons for measuring the electrical current and voltage were not explained to students. Hopefully, students could understand the reason of measuring ampere and voltage after comparing the differences of the motor designs using different wires. Furthermore, students discussed the parts of the motor that they needed to buy. During this time, students engaged in discussion within the group based on the data of amperes and voltage. Debate is important in sharing thinking and ideas based on scientific evidence (Hand et al., 2009).
To begin, the teacher introduced how the motor works based on magnetic theory, and students identified how to utilize motors in many technologies and the benefits and problems of electrical and gasoline cars. Furthermore, students were provided limited money to buy parts for the motor: three wires with different diameters, a volt meter, and ampere meter. Students measured the current and voltage of each battery (alkaline and Ni-MH batteries) and the different diameters of wire (0.32mm, 0.4mm, and 0.5mm). This activity is a type of scaffold instruction. The reasons for measuring the electrical current and voltage were not explained to students. Hopefully, students could understand the reason of measuring ampere and voltage after comparing the differences of the motor designs using different wires. Furthermore, students discussed the parts of the motor that they needed to buy. During this time, students engaged in discussion within the group based on the data of amperes and voltage. Debate is important in sharing thinking and ideas based on scientific evidence (Hand et al., 2009).
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