Homing in on energy efficiency Whats the wattage? 1200 200 30 4 watts? watts? watts? watts?
watts? 4 Watts measure the amount of work that electricity does. 2 Whats wattage? 3 More than wattage?
4 Try it! Categorizing your energy consumption Device Constant? Alternative? Refrigerator
Electricity Yes No Dryer Electricity No
Yes Television Cell phone Mower Gas stove Flashlight 5 Type of Energy
? ? More than wattage? 6 Try it! Boy, those batteries 1. 2.
3. 4. 5. Pair up with another group. Determine the average percentage of battery charge within the group. Phone with lowest charge: Predict its longest life. Phone with highest charge: Predict its shortest life. How long will it take to fully charge all the phones to 100% (starting at current battery levels and at 0%)?
Battery storage 8 What happens inside a battery? Whats the correct sequence? Electrolyte blocks electrons and converts chemical energy into electrical energy. Chemical energy is stored in the battery electrons build up at the anode (negative). Anode (negative) releases electrons that repel one another.
Electrons follow a circuit to move from the anode to the cathode. 9 What happens inside a battery? Correct sequence 1. Chemical energy is stored in the battery electrons build up at the anode (negative). 2. Anode (negative) releases electrons that repel one another. 3. Electrolyte blocks electrons and converts
chemical energy into electrical energy. 4. Electrons follow a circuit to move from the anode to the cathode. 10 Try it! How does this relate to rechargeable batteries? Show whatcha know
Elaborate on the points below. Devices require different amounts and types of energy. Watts are a common way to measure electricity use. Batteries store energy and convert it to electric energy. Rechargeable batteries provide the power for many devices. The harder batteries work, the more energy they discharge.
Power to power everything 13 Power to power everything Questions of inquiry
14 Whats the process for generating power? Can it be done in different ways? How does electricity get to homes? Whats a turbine, and how is it part of generating electricity? Whats natural gas? How does energy change forms
before it gets to your home and in your home? Power to power everything How it all works 15
3 phases? Generation? Distribution? Natural gas? Consumption? What to consider as you home in on it An energy audit is an assessment of your homes energy use and how you can reduce waste and increase energy efficiency. Are there places where the air leaks outside, wasting air thats been heated or cooled?
Are there ways to insulate equipment such as water heaters to help them work better? Do lights have energy-efficient bulbs? Are appliances and electronics using power when they dont need to? Do you open/close curtains or windows to help control the temperature? 16 Your turn Audit your home Make sure your audit template includes A checklist of items to inspect
A rough estimate of the energy each item consumes in a day/week/month A way to indicate if energy efficiency improvement is possible for each object Notes on how to improve energy efficiency for each item A projection of how much energy you could save by making changes 17 v Hey there,
Energy Efficiency Inspector! Alliant Energy congratulates you on successfully completing a home energy audit. Knowledge is power, so keep using what you learned for a better home and planet. 18
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