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.