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Curriculum Organizing Questions
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- How are electricity and magnetism related?
- How are electrical current, resistance, and voltage
related?
- What would you predict would happen to this system if
this (the current, resistance, or voltage) were to
change?
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Elaboration
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Electric and magnetic forces and the relationship between
them ought to be treated mostly qualitatively. Most
important is that students get a sense of electric and
magnetic force fields and of some simple relations between
magnets and electric currents.Benchmarks p. 93.
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Specific Ideas
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- A very small excess or deficit of negative charges in
a material produces noticeable electric forces.
Benchmarks 4G3.
- Moving electric charges produce magnetic forces and
moving magnets produce electric fields. Science Matters
p. 40.
- The interplay of electric and magnetic forces is the
basis for electric motors, generators, and many other
modern technologies, including the production of
electromagnetic waves. These can be thought of as
different aspects of a single electromagnetic
force.Benchmarks 4G5.
- Electric charge can have potential energy. The
potential energy iof electric charge is measured in
volts.Science Matters p. 44.
- Voltage is calculated by multiplying electrical
current times the electrical resistance. For example, if
you double the voltage across a wire, the current through
the wire will double.
- Electricity and magnetism are two inseperable aspects
of one phenomena. Science Matters p. 40.
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Developmental & Instructional
Implications
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Driver et al offer insights into children's thinking
about force on pages 148-153.
Driver et al offer insights into children's thinking
about electricity on pages 117-125.
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Examples
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