It is expected that students will relate electrical energy to power consumption.
Students who have fully met the prescribed learning outcome are able to:
Define electrical energy and power
Calculate the following:
- power—using voltage and current
- energy consumption—given the power rating of a device
and duration of use
RESOURCES:
BC Hydro: Energy Teaching Modules
One Day is the City of Vancouver's community engagement process in support of its Community Climate Change Action Plan.
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Review ways electricity is generated (dry cell,
static electric charges, thermocouples,
piezoelectric crystals, solar cells, and electric
generators). Show students a video on
hydroelectric generation as well as other
possible forms of electric energy generation
(solar, wind, geothermal, etc.). Alternatively,
set up stations for each of several generation
systems. Have students circulate through the
stations and complete reports in which they
identify for each system, as appropriate,
(wind) ( hydroelectric) (solar)
- the size of cells
- number of cells
- temperature difference
- size of magnet
- number of coils
- speed of rotation of coil or magnet
Have students draw diagrams and explain
how different devices generate electricity and
the factors that affect how much electricity is
generated. If a stations approach is used,
student reports can be assessed on accuracy
of observations and factors that affect current
and voltage generation.
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Remind students of the differences between
energy and power. Review definitions for
force, work, energy, power, voltage, current,
resistance, and the appropriate units for each.
• Define electrical energy and power using their
formulas. Demonstrate how to solve problems
using E = VIΔt and P = VI. Explain the use of
kW•h and J for energy and W, kW, and MW
for power. (Glossary)
• Ask students to observe their home energy
home energy consumption for a week, record the daily
readings, and determine the cost of their
electrical energy.
• Have students construct a concept map for all
the terms listed in the vocabulary for this
section.
Have students write definitions and solve
problems with respect to electrical energy and
power and duration of use. Verify that students
use appropriate units, including kilowatt,
megawatt and kilowatt-hour as well as the power
rating of devices. Award marks for proper use of
units and showing work, as well as obtaining
correct results. (Glossary)
• Assess the energy consumption records for
organization, completeness, as well as correct
calculations and use of appropriate units.
• To assess students’ concept maps, use the concept
map rubric provided at the end of the Classroom
Model for this grade.
RESOURCES:
EnerGuide Heating Cost Calculator
Appliances - EnerGuide Ratings
Interactive Energy Cost Calculator; much will it cost to operate your new appliance over the long term?
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