Word Check
Date: 2015-10-07; view: 491.
Transfer
Controlled Practice
Complete the sentences using the language presented above.
A. 1. Silicon circuits________________________________transistors, diodes, resistors and capacitors.
2. The capacitor________________________________storing the electrical signal.
3. The capacitor ________________________________two conductors separated by an insulator.
4. Capacitors, which __________ sometimes __________ condensers, can store electrical signal.
5. Diodes __________ electricity to flow in one direction. They__________
__________electricity to flow in the other.
PAIRWORK - GUESS WHAT IT IS
Student B: Turn to Key Section.
Student A: Think of an object (e.g. desk, telephone, light bulb, TV, etc.) and ask Student  to identify it by asking a series of questions, such as:
What is it?
What can it do?
What is it used for?
What is it composed of?
Student  now thinks of an object and the roles are reversed.
Note: Do not ask what it is called. You must decide from the description.
PROPERTIES
solid — a substance that is hard, cf. liquid and gas
conductivity — the ability to let electric current flow
to conduct
a conductor
resistance — the ability to stop electric current from flowing (measured in ohms)
insulation — material used to resist the flow of electricity
to insulate
an insulator
an impurity — an additional substance/element found in a pure element
to dope — to add impurities
a dopant — an impurity
COMPOSITION
a substrate — a base material on which parts can be mounted/fixed
contact leads/electrodes — a connection through which electricity can flow
— metal source contact: electric current is introduced into the transistor through this lead
— metal drain contact: electric current is taken out through this lead
— gate electrode: electric current is controlled through this lead.
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