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Solar roadwaysEquipping the Next Generation for Active Engagement in Science
2
Students willCritique claims, using reasoning, evidence and scientific knowledge
Scientific knowledge
Scientific practice
...of how light waves generate electricity in solar cells.
3
SOLARROADWAYSFREAKIN’
3
4
Science DecisionDilemma
Are solar roadways worth funding?
4
Imagine a future with solar roadways. Always snow-free and perfect for cars, bikes and buses. Then, at the flick of a switch, a sports field appears… £2 million raised so far.
crowdfund.com
Donate now to make this happen.
5
SS1-2
Dilemma Science
Identify 3 claimsStudy the evidence for each.Decide whether each claim is supported by evidence.
Will solar roadways do what the video claims?
Decision
6
SS3
Dilemma Science Decision
State your overall decision.Use evidence about each claim to explain your decision.
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Reply to the video claims
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Student sheets
Solar freakin’ roadwaysSheet no. Title Notes
SS1 Claim 1: Sunlight can be converted to electricity
Reusable, cut up, one per pair
SS2 Claim 2: Solar cells keep roads ice free
andClaim 3: The electricity will power
LED road markings
Reusable, one per pair
Student sheets
Claim 1: Sunlight can be converted to electricity SS1
Match each step (A to E) to a diagram (V to Z). Put the steps (with their diagrams) in the correct
order.Y
X
Z
VLight waves transfer energy away from the Sun.
A
Light energy knocks charged particles, called electrons, out of silicon atoms.
B
An LED turns an electric current into light.
C
Light hits a solar cell, made of silicon.
D
Moving electrons make a flow of electricity – an electric current.
E
electron that has been knocked out of an atomsilicon atom
W
Student sheets
Claim 2: Solar cells keep roads ice-free
SS2
Study the diagram. Does the science make sense?
snow or ice
heating pad
road surface made of solar
cells
Claim 3: The electricity will power LED road markings
On a bright summer day 1000 W of light energy hits each one square metre (1 m2 ) of solar roadway.The solar panels transform 10% of the energy into useful electrical power.The road markings in a typical 1 m2 of road are made up of 40 LEDs. Each LED needs 0.5 W of electricity to light.
Light energy generates electricity which powers the heater that melts the snow.
For 1 m2 of road, calculate how much electrical power the solar
panels generate how much electrical power the LED
road markings need.
Sun
light waves
Will the LEDs light in daytime? What about at night?
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Get students talking and thinking
For more, visit EngagingScience.eu
Equipping the Next Generation for Active Engagement in Science
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