electronics notes

7/21/2019 Electronics Notes

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transistor?



0011

P

P

Q



1)

Name the 3 variables



1) Draw a forward-biased diagram and label the -t!e and n-t!e diodeaccordingl!"

#) a)What is the function of diode in the diagram below?3) $nstall caacitor in the diagramb)what will haen to the current grah %ls alter the grah)

&)a) Draw a full wave recti'er circuit and b) draw the grah beside it"

5) B d th it ti b l th f ti f #) 4 l l t i i t 5



5) Based on the situation below, name the function oftransistor in the situations:a) (ver! commercial buildings have to install this to

light u the buildings at night"

b) s safet! recaution in ever! hotel rooms"

c) *ire alarm

3)

d) What is the function of this transistor? ++++++++++++++++

e) ,abel ./ ++++++++++++++++++++++++ !/ ++++++++++++++++

$ b / +++++++++++++++++++++++++ $ c/ +++++++++++++++++++ f) What haen if ! is set to ero?

g) What haen if ! is increased?

h) When will base current ow?

i) What haen when base current ow?

2) What is the relationshi between base current andcollector current?

) What haen when collector current ows?

#) 4alculate ma.imum resistance 5so that the bulb is light u

&)

a) What is the function of transistor in the diagram?

b) What is ,D?c) 6ased on the diagram7 which is /i) *i.ed resistor/ ++++++++++++++ ii) variable resistor/

++++++++++++ d) 8his transistor can switch on light during the +++++++++

because in the dar/ii) esistance of ,D/iii) 6ase current/iv) 9oltage across ,D/v) 8ransistor is/vi) 6ulb will be/e) What can !ou do to change this circuit so that it will switchon during the da!?f) Pls give a reason to install the ,D at section// ++++++++++++++++++++++ 6/ +++++++++++++++++++++++++++++

P : #0 ohm#9;9

6

5) B d th it ti b l th f ti f #) 4 l l t i i t 5



5) Based on the situation below, name the function oftransistor in the situations:a) (ver! commercial buildings have to install this to

light u the buildings at night"

b) s safet! recaution in ever! hotel rooms"

c) *ire alarm

3)

d) What is the function of this transistor?e) ,abel ./ ++++++++++++++++++++++++ !/

++++++++++++++++ $ b / +++++++++++++++++++++++++ $ c/ +++++++++++++++++++ f) What haen if ! is set to ero?

g) What haen if ! is increased?

h) When will base current ow?

i) What haen when base current ow?

2) What is the relationshi between base current andcollector current?

) What haen when collector current ows?

#) 4alculate ma.imum resistance 5so that the bulb is light u

&)

a) What is the function of transistor in the diagram?

b) What is ,D?c) 6ased on the diagram7 which is /i) *i.ed resistor/ ++++++++++++++ ii) variable resistor/

++++++++++++ d) 8his transistor can switch on light during the +++++++++

because in the dar/ii) esistance of ,D/iii) 6ase current/iv) 9oltage across ,D/v) 8ransistor is/vi) 6ulb will be/e) What can !ou do to change this circuit so that it will switchon during the da!?f) Pls give a reason to install the ,D at section// ++++++++++++++++++++++ 6/ ++++++++++++++++++++++

P : #0 ohm#9;9

6

1) What is



1) What isuorescent screencoatedinsidewith?

#) Whathaenswhenelectronbeamstriesthe

surface?

3) Name theenerg!changefrom

movingelectronto thescreen?

&) Name 3functionsof 4</

1) What haen when ower sul! switch on?

#) Wh! maltese cross shadow is formed?

3) =ow to accelerate the electrons?

&) What is cathode ra!?>) What haens when cathode ra! bloced b! maltase

cross?

) @ive one characteristic of cathode ra!"

A) What is the observation when (=8 is switched on?

;) =ow is light energ! converted?

B) <bservation when strong magnet laced at the side of

maltese cross tube/

10) @ive one characteristic of cathode ra!"



64

D

1) What is the function oftransistor?

#) ,abel// 6/4/ D// b/3) 5o that alarm will ring during 're7Which should be higher7 resistance of or ?

&) During a 're/a) esistance of /b) esistance of /c) 6ase voltage/d) 8ransistor/e) ela! switch/f) *ire alarm/

>) What is the function of this circuit?

) 4onclusion/ 8hermistor has highresistance because

+++++++++++++++++++++and lowresistance because

++++++++++++++++++++"A) What is the function of diode?

10)

Please correct the circuit

1A) 4alculate ma.imumresistance 5so that the bulb is light u

P : 10 ohm&9

1#

1) What is



1) What isuorescent screencoatedinsidewith?

#) Whathaenswhenelectronbeamstriesthe

surface?

3) Name theenerg!changefrom

movingelectronto thescreen?

&) Name 3functionsof 4</

1) What haen when ower sul! switch on?

#) Wh! maltese cross shadow is formed?

3) =ow to accelerate the electrons?

&) What is cathode ra!?>) What haens when cathode ra! bloced b! maltase

cross?

) @ive one characteristic of cathode ra!"

A) What is the observation when (=8 is switched on?

;) =ow is light energ! converted?

B) <bservation when strong magnet laced at the side of

maltese cross tube/

10) @ive one characteristic of cathode ra!"



64

D

1) What is the function oftransistor?

#) ,abel// 6/4/ D// b/3) 5o that alarm will ring during 're7Which should be higher7 resistance of or ?

&) During a 're/a) esistance of /b) esistance of /c) 6ase voltage/d) 8ransistor/e) ela! switch/f) *ire alarm/

>) What is the function of this circuit?

) 4onclusion/ 8hermistor has highresistance because

+++++++++++++++++++++and lowresistance because

++++++++++++++++++++"A) What is the function of diode?

10)

Please correct the circuit

1A) 4alculate ma.imumresistance 5so that the bulb is light u

P : 10 ohm&9

1#

391000ohm

3 : 10001> 1000C !



NND

N<8

0011

0101

1110

1010



(a)Inference : The strength of the output signalof the amplier depends on the input currentof the amplier.

(b) Hpothesis: The larger the input current in anamplier circuit, the larger the output current.

(c) (i) !im: To determine the relationshipbetween base current and collector current of a

transistor amplier circuit.

(ii) "anipulated #ariable: Base current, I B esonding variable / 4ollector current7 $ 4 $i%ed #ariable : &uppl #oltage

(iii) !pparatus and materials: npn transistor, 'batteries, microammeter, miliammeter, rheostat,connecting wires.

(i#) $unctional arrangement of apparatus.

(a) (i) : 4o '(i)



(a) (i)*

In a direct current, the current +ows in onedirection onl.In a alternating current, the current changesre#erses it direction periodicall

.(ii) -ircuit : the diode is forward biased, the bulb is lighted. -ircuit / : the diode is re#ersed biased, thebulb is not lighted.0elationship:111111.- $unction of a diode: 2iode onl allows

current to +ow in one direction onl.

(b)

! ptpe semiconductor is produced b addingtri#alent impurit material such as boron orgallium to silicon.- In a ptpe semiconductor, ma3orit of the

charge carriers are the positi#eholes

- . ! ntpe semiconductor is produced badding penta#alent impurit material

- such as phosphorus or arsenic to silicon.- In a ntpe semiconductor, ma3orit of the

charge carriers are the free electrons.

: 4o. '(i) 0ectication is a process of con#ertingalternating current to direct current.(ii) hen an alternating current +ows in the

primar coil, a changing magnetic eldis produced

. The changing magnetic eld is lin6ed to thesecondar coil through the laminated ironcore.- !s a result, a secondar coil is in a changing

magnetic eld, this procedures an inducede.m.f at the two ends of secondar coil

- .(iii) It must be a stepdown transformer to stepdown the #oltage from '78 9 to ' 9.The ratio: Primar! / secondar! : #&0E1# : #0/1 - full-wave recti'cation is better than a half-wave recti'cation7 because

a half-wave recti'cation loses half the inutower as heat" smoothing caacitor is reFuired to changethe ulsating d"c to a constant d"c"- 8he most suitable circuit to be used is circuitG because HHHHHHHHHHHHHHHH"

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