NPN Transistor Soldering

These are examples of

• Insulators

• Conductors

A conductor

• Is usually a metal

• Conducts heat

• Can be a copper wire

• All of the above

What is the difference between a conductor and an insulator?

• An insulator allows an electrical charge & heat to flow through it easily and a conductor does not

• A conductor allows an electrical charge & heat to flow through it easily and an insulator does not.

• An insulator is magnetic and a conductor is not.

• An insulator and conductor are two names for the same thing.

A transistor is essentially what?

• An output device

• An electronic switch

• A deivce that limits the flow of power

Answer explanation

Transistors sense small changes in charge, hence they are used in sensing circuits. Components such LDRs, Thermistors or Moisture Probes are commonly found in these circuits as well.

What are the 3 legs of a transistor called?

• Base, Electrode, Commiter

• Bridge, Collector, Extruder

• Base, Collector, Emitter

• Anode, Cathode, Gate

Answer explanation

An Anode, Cathode & Gate indicate the legs on a Thyristor. The component you used in your year 09 steady hand game project. It is important that you do not get these components confused

A soldering iron can reach what temperature?

• 200 - 300 deg C

• 100 - 200 deg C

• More than 400 deg C

• 50 - 100 deg C

What precaustion must we take when soldering an NPN Transistor

• Protect the component from electrical charge

• Protect the component from heat

• Protect the conpomonent from static discharge

• Protect the component from air

Why is a housing unit soldered to the PCB and the Transistor then inserted to the housing?

• The legs are two close together

• The Transistor legs are too small to use a heat sink

• Heat from the soldering iron would damage the Transistor internals

• Transistors are very unreliable and it is easier to change them when they are fitted to a housing

Select the picture that shows a prefect soldering.

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Where should the iron be stored when not in use?

• Stand

• On a special heat proof mat