The top two photographs show the front (left) and the rear (right) of a sign warning motorists approaching a school to take care - Junior Cycle Science - Question b - 2008
Question b
The top two photographs show the front (left) and the rear (right) of a sign warning motorists approaching a school to take care. The photograph underneath shows the... show full transcript
Worked Solution & Example Answer:The top two photographs show the front (left) and the rear (right) of a sign warning motorists approaching a school to take care - Junior Cycle Science - Question b - 2008
Step 1
i) Name the energy from the sun that the panel changes into electricity.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The energy from the sun that the panel changes into electricity is light energy, often referred to as photons.
Step 2
ii) Name the form of energy that can be stored in a battery.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The form of energy that can be stored in a battery is chemical energy.
Step 3
iii) Give two energy conversions that occur to produce the flashes of light warning motorists approaching the school on dark mornings.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The conversion from chemical energy in the battery to electrical energy as the battery discharges.
The conversion from electrical energy to light energy as the lights flash.
Step 4
iv) Identify the devices shown in the diagram. (There are three in the diagram; when operating they give out light).
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The devices shown in the diagram are Light Emitting Diodes (LEDs).
Step 5
Give a reason for this wide application.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
LEDs are often used because they use very little energy, are reliable, can be switched on and off rapidly without burning out, and have a long lifespan, fitting into small spaces.
Join the Junior Cycle students using SimpleStudy...
