Abstract:
The aim of this study was to develop the instrument to make magnet by
electromagnetic and to determine the Lorentz force in teaching and learning process
of science at junior high school. Type of research is R & D (research and
development). The development of this experiment includes the study of introduction,
literature study, planning, development, validity and practicalities. The instrument
that was developed is the instrument and the manual user. Based on the description of
the data, is was obtained that the validation of the instrument is 84% and the manual
user has 82,2% validation while the validation of the construction is 81,3% with the
excellent category. The data that was obtained from the practical experiment showed
the excellent level with the level of the percentage is 89% and the manual user is
82%, so that this instrument is recommended to use in teaching and learning process
at Junior High School.
