f3 - worksheet 8.1 - 8.2 · 2016. 7. 7. ·...
TRANSCRIPT
Form 3 Science – Chapter 8 (Generation of Electricity) : Unit 8.1 – Unit 8.2
Form 3 Worksheet Unit 8.1 – 8.2 prepared by Ms Sue Page 1
1. Complete the following table to show the comparison between different types of generator.
Type of Generator Description Energy Changes Used in
• Uses ________________________________ as a fuel to boil water in a large boiler
• Steam under high pressure is channeled to turn a _______________
• The turbine drives a ______________ which produces ________________________
• After turning the turbine, steam is condensed by a condenser into water and is returned to the boiler
• Usually located near _______________ _______________ or ____________ so that fuel is easily obtained
• _______________ • _______________ • _______________
• A _______ is built across a river
with a continuous flow to collect
water in a high _____________
• Water is channeled through a tunnel
to spin a ______________
• The turbine spins a ____________
which produces electrical energy
• ________________ can be used to
control floods, irrigating paddy
fields and fish rearing
• _______________
(Perak)
• _______________
(Pahang)
• _______________
(Terengganu)
Form 3 Science – Chapter 8 (Generation of Electricity) : Unit 8.1 – Unit 8.2
Form 3 Worksheet Unit 8.1 – 8.2 prepared by Ms Sue Page 2
• Air is sucked in, filtered and compressed by a compressor
• Compressed air is mixed with the _______________
• Mixture of air and gas is ignited by a ______________ in a combustion chamber
• The ignited mixture burns and expands with great ___________ which turns the turbine and dynamo to produce electrical energy
• Not efficient as a lot of ____________ is lost during the generation process
• Usually situated
in places where
___________ is
easily obtained
• ___________
(Terengganu)
• A ____________________ is used to supply electrical energy to a small place such as a village or an amusement park
• Similar to the diesel engine car • Diesel burning in the engine produces
a great __________________________ which drives a ____________ that turns a dynamo to produce electrical energy
• _______________,
Taiping
• ________________
Form 3 Science – Chapter 8 (Generation of Electricity) : Unit 8.1 – Unit 8.2
Form 3 Worksheet Unit 8.1 – 8.2 prepared by Ms Sue Page 3
• Nuclear energy is produced in a reactor by __________________________
• Heat from the nuclear energy is used to boil water to obtain ___________
• Steam under high pressure is used to spin a ____________ which in turn drives a dynamo that produces electrical energy
• Steam is later _________________ into water again by a condenser and returned to the boiler
• Many people against the use of this generator because nuclear energy is _______________ and life-threatening due to its __________________________
2. Complete table given below to show the comparison between STEP-UP TRANSFORMER and STEP-DOWN TRANSFORMER.
Type of transformer /
Details STEP-UP TRANSFORMER STEP-DOWN TRANSFORMER
Primary coil • Has _________________________ •
Secondary coil • Has _________________________ •
Input
VOLTAGE CURRENT VOLTAGE CURRENT
Form 3 Science – Chapter 8 (Generation of Electricity) : Unit 8.1 – Unit 8.2
Form 3 Worksheet Unit 8.1 – 8.2 prepared by Ms Sue Page 4
Output
VOLTAGE CURRENT VOLTAGE CURRENT
Diagram
3. Answer the following questions :-
(a) Transformer is never efficient because of __________________________ in the coils and ______________________ in the
form of __________ in the ___________________.
(b) Efficiency of transformer is raised by using
(i) _______________________ for the coil ( __________________________ ) ;
(ii) _______________________________________ to form the core – this reduces the amount of _________ produced in
the core.