|
TEACHER NOTE:
You
may wish to use this activity to introduce, review, or enrich
students' understanding of schematic diagrams. The
materials needed for this activity can be purchased at a local
hardware store or electronics specialty shop.
SAFETY:
Review all safety procedures associated with heat generated
by this type of electromagnetic circuit. Remind students to
keep the circuit closed for ONLY short periods of time. With
the current flowing, the wire will heat to temperatures that
can cause burns.
ANSWERS
- What caused the ball to move down the ramp (attraction
of gravity)?
- What force diverted the ball's downward roll? (magnetic
attraction)
- What produced the magnetic force? (When current ran through
the nail's wire wrap, the nail became an electromagnet.)
- Suppose no magnetic attraction affected the ball's movement.
Describe its path. (Ball would move straight down the incline
without diverting to the side) How can this laboratory experience
be applied to the challenges faced by FES? (In order to
direct the ball's movement, you needed to coordinate the
actions of individual magnets. Similarly, a movement such
as "standing transfer" requires the coordination of muscle-stimulating
electrodes - first getting up and shifting sideways to transfer
into another seat. In addition, electricity was used as
the input energy form to direct both movements.)
SCIENCE
IN YOUR WORLD
What is the advantage of this type of charging? (Reduced risk
of electrocution)
Why is this type of charging utilized for meeting the electrical
demands of biotech devices implanted beneath the skin? (Since
the skin heals over the implant, there is a reduced chance
of infection. When the battery runs out, you won't need to
"plug in" a recharging wire. An induction circuit sitting
on the skin's surface will power up the battery.)
CURRICULUM
LINKS
| Physics:
|
| Electricity,
Electric Circuits, Energy, Transformations of Energy
|
|
NATIONAL
SCIENCE STANDARDS (Grades
5-8)
| Science
As Inquiry-Content Standard A |
| Students
should develop abilities necessary to do scientific inquiry, |
|
Students should develop an understanding about scientific
inquiry |
| Physical
Science -Content Standard B |
|
Students should develop an understanding of motion
and forces |
|
Students should develop an understanding of transfer
of energy |
| Life
Science -Content Standard C |
|
Students should develop an understanding of structure
and function in living systems |
| Science
and Technology -Content Standard E |
|
Students should develop an understanding about science
and technology |
 Back
to Teaching Guide
|
