File

Name: ___________________________________________
Group: __________
Support activities – Second Year of Secondary Cycle Two
ACTIVITY 63 ANSWER KEY
Date: __________________
AST
STUDENT BOOK: Chapter 14, pages 473–478
RELATED HANDOUT: Concept review 63
Components with other functions
1. Complete the following sentences, using the words or groups of words in the box below. You
may use some words more than once.
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amplify
bigger
block
capacitance
capacitor
collector
computer
digital circuits
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diode(s)
direct current
direction
electrical charge
electrical contact
electromagnet
electromechanical
relay
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emitter
farads
high-voltage
insulating material
light-emitting diodes
light-sensitive cells
low-voltage
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powerful
protect
relay
signal
solid-state relay
stabilize
transistor(s)
capacitor
a) A ___________________________
is a device composed of two electrical surfaces
insulating material
separated by an ___________________________
. The device can store an
electrical charge
___________________________
. This ability to store energy is called
farads
capacitance
“___________________________
” and is expressed in ___________________________
.
diode
b) A ___________________________
is a device that allows electric current to flow in only
direction
Diodes
one ___________________________
. ___________________________
can guide and
protect
block an electric current, ___________________________
fragile electronic parts and
direct current
convert alternating current into ___________________________
.
Light-emitting diodes
___________________________
(LEDs) give off light when a current flows through them.
électroluminescentes
transistor
c) A ___________________________
is an electronic device used to
block
amplify
___________________________
or ___________________________
an electric current. It
Observatory / Guide
11129-B
in the field of electronics.
collector
is made up of a ___________________________
, a base and an
Transistors
emitter
___________________________
. ___________________________
play an important role
© ERPI Reproduction and adaptation permitted solely for classroom use with Observatory.
A capacitor can release its stored charges almost instantly; it can also serve to
stabilize
___________________________
a fluctuating power supply.
1
ANSWER KEY
Support activities – Second Year of Secondary Cycle Two
ACTIVITY 63
Components with other functions Name: ___________________________________________
Group: __________
Date: __________________
relay
d) A ___________________________
is a component used to control a
high-voltage
___________________________
circuit from a distance with a
low-voltage
low-voltage
___________________________
circuit. The ___________________________
signal
circuit emits a___________________________
that can come from a switch, a
computer
___________________________
or a photoelectric (light-sensitive) cell. There
electrical contact
is no ___________________________
between the two circuits. In an
electromechanical relay
___________________________
, the control depends on an
electromagnet
___________________________,
which causes metallic parts to move. In a
solid-state relay
___________________________
, control is made possible by an LED and
electromechanical relay
light-sensitive cells
___________________________
. An ___________________________
has a shorter life
bigger
span and photosensibles
is ___________________________
, but it can control more
powerful
solid-state relay
___________________________
circuits. A ___________________________
is usually
digital circuits
airtight and more compatible with ___________________________
.
2. What am I?
a) I can be found in remote controls, where I protect electronic parts when the battery is
installed upside down.
A diode
b) There are millions of me in computers.
A transistor
c) I am made up of two metal plates separated by a dielectric.
d) I am used in theatre lighting systems, the heating systems of public buildings and industrial
motors.
A relay
3. Explain how a camera flash works.
A camera flash works with a capacitor. A battery recharges the capacitor until an indicator lights
up. When the photographer presses the shutter button, the capacitor releases its full charge in a
Observatory / Guide
11129-B
fraction of a second, producing a bright light.
© ERPI Reproduction and adaptation permitted solely for classroom use with Observatory.
A capacitor
2
ANSWER KEY
Support activities – Second Year of Secondary Cycle Two
ACTIVITY 63
Components with other functions Name: ___________________________________________
Group: __________
Date: __________________
4. True or false? If the statement is false, correct the error.
a) LED bulbs consume less energy than ordinary light bulbs.
True
b) In a transistor, the collector acts like a door that can block or facilitate current flow.
False. This function is performed by the base.
c) Binary code works with the help of capacitors.
False. It works with the help of transistors.
d) A diode is made of silicon, which is a semiconductor.
True
5. How does a diode transform alternating current into direct current?
A diode allows electric current to flow in only one direction, so it prevents the back-and-forth
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11129-B
© ERPI Reproduction and adaptation permitted solely for classroom use with Observatory.
movement of alternating current.
3
ANSWER KEY
Support activities – Second Year of Secondary Cycle Two
ACTIVITY 63
Components with other functions