symbolece.pdf

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VCE Physics and VCE Systems Engineering: Table of electronic symbols

In response to requests from teachers the VCAA has produced a table of commonly usedelectronic symbols. Practicing teachers have provided advice in the selection of recommendedand alternative symbols that appear in the table. Students may expect to see either therecommended or alternative symbols on the VCE Physics and VCE Systems Engineeringexamination papers. Teachers and students are likely to encounter the symbols shown in thetable, and other symbols, in other publications. Teachers are encouraged to ensure students areflexible in their understanding and recognition of electronic symbols.

From the table, individual symbols may be selected, cut or copied and pasted into otherdocuments and may assist teachers in the preparation of tests, revision sheets and drawingcircuit diagrams.

All symbols have been generated using the Drawing tools in Microsoft Word. Each has beenGrouped so that it will remain intact when selected, copied and pasted to generate a circuitdiagram.

The recommended symbols are provided in their acceptable orientation/s. The orientation of allsymbols can be changed using the Drawing commands Rotate Left, Rotate Right, Flip VerticalorFlip Horizontal.

Aids in joining copied symbols by drawn lines on a required circuit diagram:

On the Drawing grid set Snap objects to other objects.

UnderAutoShapes, select Connectors, then Straight connector.

The dot () to indicate electrically connected points in the diagram can also be selected fromthe following table.

Enquiries regarding the table should be directed to the following Curriculum Managers:

Technology Manager, Lorraine Tran (03) 9651 4407 [email protected] Manager, Maria James (03) 9651 4655 [email protected]


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ELECTRIC AND ELECTRONIC SYMBOLS VCE SYSTEMS AND TECHNOLOGY AND VCE PHYSICS

VCAA MARCH 20072

Electric and electronic symbols for VCE Physics and VCE Systems Engineering

For each component a recommended symbol is shown in its normally accepted orientation/s, i.e. vertically and/or horizontally. Inelectronics there is a longstanding convention to show most components with a vertical orientation and for the circuit to read from thesource or input on the left to the output or remaining circuit on the right. Otheralternative symbols that may be encountered are alsoshown. Notes include relevant acceptance of symbol.

Component

groupComponent Recommended symbol Alternative symbols Notes

cell

battery,DC power supply

variable DC powersupply

sources

AC power supply

resistors resistor Alternative symbol nowregarded as outdated.


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ELECTRIC AND ELECTRONIC SYMBOLS VCE PHYSICS/VCE SYSTEMS ENGINEERING

VCAA MARCH 20073

Componentgroup

Component Recommended symbol Alternative symbols Notes

variable resistor,potentiometer,voltage divider

A variable resistor wherethe variation is achieved byuse of a sliding contact.

variable resistor A general symbol for avariable resistor where themeans of variation is not

specified.

light-dependentresistor (LDR)

filament globe

thermistor

fuse


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VCAA MARCH 20074

Componentgroup


(non-polarised)capacitor

variable capacitor

capacitors

polarised capacitor,electrolytic capacitor

iron-cored

transformer(one secondarywinding)

iron-coredtransformer(one secondary

winding centre-tapped)

transformers

iron-coredtransformer(two secondarywindings)


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VCAA MARCH 20075

Componentgroup


junction diode Additional alternativesymbols forall diodesinclude those where thesingle straight-line sectionof the symbol is shown asa heavier line.

Zener diode

photo diode

diodes

light-emitting diode(LED)


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VCAA MARCH 20076

Componentgroup


diode bridge

(Note that in an earlier version ofthis table, this symbol was

incorrectly represented.)

There are alternative formsusing the other alternativesymbols for thejunctiondiode given above.

npn transistor Additional alternativesymbols forall transistorsinclude those where thevertical straight-line sectionof the symbol is shown asa heavier line.

pnp transistor Both orientations of the

recommended symbol areused depending onwhether the emitter(E) isat the bottom or top.

n-type junction fieldeffect transistor(NJFET)

transistors

p-type junction fieldeffect transistor(PJFET)

B

E

C

BC

E

B

E

C

BC

E

E

C

B

E

C

B

G

D

SG

D

S

G

D

S

D

SG


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VCAA MARCH 20077

Componentgroup


integratedcircuits

integrated circuit (IC) This example shows an ICwith 8 connections. Othersoccur, e.g. 14 and 16.Under alternative symbolsidentifying marks areshown to indicate thenumbering of the

connections.Other conventions showonly the connections usedin a given circuit, here 1, 3,4, 7 and 8.

single pole, singlethrow (SPST) switch

single pole, doublethrow (SPDT) switch

double pole, single

throw (DPST) switch

switches

double pole, doublethrow (DPDT) switch

1

4

3

87

1

2

4

3

8

7

5

6

1

2

4

3

8

7

5

6

1

2

4

3

8

7

5

6


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VCAA MARCH 20078

Componentgroup


normally open(NO) switch

normally closed

(NC) switch

relay

ammetermeters

voltmeter

AA A

VV V


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VCAA MARCH 20079

Componentgroup


galvanometer The alternative symbol isnot recommended as it issometimes used to indicatea generator.

cathode rayoscilloscope (CRO)

Neither of theseencountered symbols iswidely used.

voltage amplifieramplifiers

operational amplifier(op amp)

On the alternative symbolthe two verticalconnections are shown

when it is connected to thepower supply.

transducers motor

M

G

CROCRO

M


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VCAA MARCH 200710

Componentgroup


microphone

loudspeaker

NOT or invert gate

OR gate

XOR (exclusive OR)

gate

logic gates

NOR gate

1

1

1

= 1


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VCAA MARCH 200711

Componentgroup


AND gate

NAND gate

flip-flop T (toggle) flip-flop

earthexternalconnections

aerial

circuitconnections

non-connected leads Alternative symbolregarded as outdated.

Q

Q

T

Q

Q

T

falling edgetriggered

&

&&

rising edgetriggered


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VCAA MARCH 200712

Componentgroup


connected leads

dot for junction of

connected leads

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