Read the following passage and answer the questions below - Leaving Cert Physics - Question 11 - 2020
Question 11
Read the following passage and answer the questions below.
WHAT ARE GREENHOUSE GASES?
A wide range of gases contribute to climate change. These are known as greenho... show full transcript
Worked Solution & Example Answer:Read the following passage and answer the questions below - Leaving Cert Physics - Question 11 - 2020
Step 1
Name two greenhouse gases that are contributing to climate change.
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Answer
Two greenhouse gases that contribute to climate change are carbon dioxide (CO₂) and methane (CH₄).
Step 2
State one of the impacts of climate change that Ireland has experienced.
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Answer
One impact of climate change that Ireland has experienced is extreme weather events such as flooding.
Step 3
An electric car uses a battery to make the car move. What energy conversion takes place when this happens?
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Answer
The energy conversion that occurs is the transformation of chemical energy stored in the battery into kinetic energy to move the car.
Step 4
What is renewable power?
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Answer
Renewable power is energy that is generated from sources that are naturally replenished, such as solar, wind, and hydroelectric energy.
Step 5
What is the SI unit of power?
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Answer
The SI unit of power is the Watt (W).
Step 6
What is meant by U-value?
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Answer
U-value is a measure of how effective a building material is as an insulator. It is expressed in watts per square meter per Kelvin (W/m²K).
Step 7
Calculate the power of the turbine.
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Answer
Power is calculated as energy divided by time. The turbine generates 90 MJ (90,000,000 J) of energy in 60 seconds. Thus, the power is:
ext{Power} = rac{ ext{Energy}}{ ext{Time}} = rac{90,000,000 ext{ J}}{60 ext{ s}} = 1,500,000 ext{ W}
So, the power of the turbine is 1.5 MW.
Step 8
Other than wind energy, name two other sources of renewable power used in Irish homes.
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Answer
Two other sources of renewable energy used in Irish homes are solar energy and geothermal energy.
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