O In this lesson, students determine
the financial and environmental cost
of some common appliances by
measuring their energy
consumption with a watt meter.
Then, the cost effectiveness of a
new refrigerator purchased is
evaluated through payback
O Students will be able to correctly measure
the energy consumption of various
appliances by using a Kill-A-Watt meter
O Students will be able to calculate an
estimated annual energy cost for common
O Students will be able to correctly
differentiate between energy and power
O P.12.C.2- students know energy forms can be
O P.12.C.6 – students know electricity is transferred
from generating sources for consumption and
O N.12.B.2 – students will know consumption
patterns , conservation efforts and cultural or social
practices in countries have varying environmental
Next Generation Standards
O HS-PS3-1: Create a computational model to
calculate the change in the energy of one component in
a system when the change in energy of the other
component(s) and energy flows in and out of the system
O HS-PS3-3: Design, build, and refine a device that
works within given constraints to convert one form of
energy into another form of energy.
O HS-PS3-5. Develop and use a model of two objects
interacting through electric or magnetic fields to illustrate
the forces between objects and the changes in energy of
the objects due to the interaction.
O Energy and Matter:
Changes of energy and matter in a
system can be described in terms of energy
and matter flows into, out of, and within that
O Kill-A-Watt meters ( one per group of 3-4
O Activity worksheets
O At least 5 various classroom and home
appliances for the students to measure
O Arrange the appliances in stations around the
O Energy - a measureable quantity of work;
energy= power × time
O Power – the rate at which energy is used ;
power= energy ÷ time
O Watt – energy unit equivalent to the power you need to lift 100g.
(a small apple) a distance of 1 meter in 1 second
O Watt-hours- a measure of energy usage; watts × hours of use
O Kilowatts –hours - watt ÷ 1000
O Phantom load – the electrical power consumed an appliance
when it is switched off or in standby mode; sometimes called
1. What is the difference between
energy and power ?
2. List three appliances that you think
may have a phantom load and give
3. Explain how appliances usage
impacts the environment?
Appliance Watts Hours
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