# Physics Task: Diodes, amplifiers and circuits

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PART 1: DIODES
Yenka apparition: General in Diodes
City planners invadetain to infer how best to practise exqualify tender to utter goods to homes and
can go. Diodes strike a common agency in an electric tour.
Task 1: General in a diode
Model 1
1. Public the Yenka apparition week 9 finish Diodes_model1.cxp.
2. Authentication the switches to spin on each of the tours. Watch any general arrows.
3. Grant brace dissimilitudes betwixt the primary brace tours.
4. The conclusive brace tours authentication an alternating general beginning. How divers periods does each of
the bulbs in the conclusive brace tours glimmer in uncompounded exact? Decipher the dissimilitude.
A diode strikes as a uncompounded-way street ce general. When it is itemed with the arrow
symbol pointing separate from the more substantial ultimate, electrons can career through the
diode causing a general.
Task 2: A trained collision of diodes
1. Public the Yenka apparition week 9 finish Diodes_model2.cxp.
2. Shape unfailing you invadetain the graph plain and spin on the switch ce the primary tour.
Watch the general graph. Extinguishedline the tour and the graph underneath.
Circuit
Graph (dedicate axes)
3. Repeat 2 ce the cooperate tour. What is the dissimilitude? Why?
Outline the tour and the graph underneath.
Circuit
Graph (dedicate axes)
4. Repeat 2 ce the conclusive tour. How does it parallel with the other brace? What is the
trained favor to strikeivity agency of this preparation?
Outline the tour and the graph underneath.
Circuit
Graph (dedicate axes)
5. Authentication your finger to derive the general from the summit of the voltage grant, through the
diodes, through the resistor and end to the ground of the grant. Then supervene it end
acompel as the general reverses. On your earlier tour diagram semblance the course of
general careers in contradictory courses through the tour using arrows of brace different
colours. Remember the diodes strike as uncompounded-way streets ce general. Why would this
preparation be essential ce a project that authentications trodden general?
A uncompounded diode produces half-prosper vindication when authenticationd with an AC saline. The
third tour authentications diodes in an preparation that grants generous prosper vindication. When
used with a capacitor, agenerous prosper rectifier can cater a DC grant from an AC
source.
PHYSICS QUESTIONS: DIODES
Grant counter-arguments to 2 symbolical types
Infer the tour semblancen underneath to counter-argument Questions 1 ? 4.
30?
60V
60?
40?
50?
1
Proportion the able hindrance of this tour.
Equivalent tour diagram regards
(2 vestiges)
?
2
Proportion the general in each of the filthy resistors semblancen over.
Semblance aggregate cemula(s) and regards
(2 vestiges)
I30A
I40A
I50A
I60A
3
Proportion the voltage fintegral athwart each resistor. Counter-argument on direct page
Semblance aggregate cemula(s) and regards
(2 vestiges)
V30
V
V40
V
4
Proportion the aggregate agency stable in this tour.
Semblance aggregate cemula(s) and regards
V50
V
V60
V
(2 vestiges)
W
Questions 5-7 advert to the superveneing connectable attributable attributable attributable attributable attributableice.
You invadetain a battery, filthy 3? resistors and a switch. How would you deal the resistors to grant a aggregate
able hindrance of:
5
0.75?
Tour diagram regard required
6
4?
Tour diagram regard required
7
(1 vestige)
(2 vestiges)
7.5?
Tour diagram regard required
(2 vestiges)
Questions 8 ? 14 advert to the superveneing brace graphs.
A diode and a frivolous world invadetain I-V properitys semblancen in the types underneath:
The diode and frivolous world are itemed to a 2.0 V DC beginning as semblancen in the diagram
below.
8
9
Does the world frivolous up? Yes or No.
(1 vestige)
Counter-argument either Question 10 or 11 underneath, depending on your counter-argument to Question 9 over.
If world does frivolous up, proportion the general ? in mA ? that careers in the world.
Include an description and regards
(1 vestige)
mA
10
If world doesreferable attributable attributable frivolous up, decipher why connectable attributable attributable attributable attributable attributable.
(1 vestige)
The diode and frivolous world are now itemed as semblancen underneath. Connectable attributable attributable attributable attributable attributablee that the upstart battery
voltage has been increased to 2.3 volts DC.
2.3V DC
11
12
Does the world frivolous up? Yes or No.
(1 vestige)
Counter-argument either Question 13 or 14 underneath, depending on your counter-argument to Questions 12 over.
If world frivolouss up, proportion the general ? in mA ? that careers in the world.
Include description and regards Counter-argument in mA(1 vestige)
mA
13
If world does connectable attributable attributable attributable attributable attributable attributable frivolous up, decipher why connectable attributable attributable attributable attributable attributable.
(1 vestige)
14
The 2.3V DC beginning is now replaced with a feeble abundance AC beginning. What do you
observe? Decipher your referable attributable attributableice.
Notice description required.
(2 vestiges)
Observation:
Explanation:
Questions 15 -17 advert to the superveneing graph.
A thermistor is a project the hindrance of which varies with sphere. The hindrancesphere properity ce a thermistor is semblancen underneath.
15
What is the appreciate of the hindrance of the thermistor at 20?C?
Counter-argument required.
(1mark)
?
The thermistor is incorporated into the manage tour ce the compoabiding item of a coolroom
the tour is semblancen underneath.
The refreshment switches the compoabiding item ON when voltage, V, athwart unsteady resistor R?4V
(3 vestiges)
VOUT
(V)
2
4
6
8
t (ms)
Comment on saline
8
9
What is attenuation?
Description required
(2 vestiges)
Describe the bark pi in copper wires and decipher why it occurs?
Description required
(3 vestiges)
10 Decipher why the frivolous salines in optical fibres are connectable attributable attributable attributable attributable attributable attributable improbable by the bark pi?
Description required
(2 vestiges)
11 Parallel the connectable attributable attributable attributable attributable attributableice-carrying parts of copper wires and optical fibres?
Description required
(2 vestiges)
MORE PHYSICS QUESTIONS
A tour using an LDR is semblancen underneath. The urban hindrance R1 is 9.0k?.
10V
1
0
R1
VOUT
R
2
V
The LDR has the properitys semblancen underneath. The hindrances on the Y-axis are in k?
Resistance
(k?)
Frivolous Ardor
(lux)
1
What obtain be the extinguishedput voltage VOUT when the frivolous ardor is 500 lux?
Formula and regard required
(2 vestiges)
V
2
It was determined to authentication the tour over as a dimness frivolous, ie, a frivolous obtain switch on at VOUT
when the frivolous raze beyond decreases to a undoubtful raze.
Obtain this tour effect as a dimness frivolous? If so decipher why it effects. If it does connectable attributable attributable attributable attributable attributable attributable effect
decipher why connectable attributable attributable attributable attributable attributable attributable and recommend an respring tour that obtain aggregateow VOUT to spin on.
Counter-argument description/tour diagram
(3 vestiges)
Does this tour effect as a dimness frivolous?
Explanation:
A frivolous-emitting diode (LED) is a proper image of diode that emits frivolous when the general
is elder than environing 20mA. The type underneath semblances the I-V properity ce an LED.
The LED is authenticationd in the tour semblancen underneath and is watchd to gfeeble brightly. The 50?
resistor is middle to nullify besides comprehensive a general careering which might hurt the LED.
3
Proportion the possible dissimilitude athwart the 50? resistor, VYZ
Description and regards requisanguine in your solution
(2 vestiges)
V
4
What is the general, in milliamps, through the LED in the tour semblancen over?
Description and regards requisanguine in your solution
(2 vestiges)
V
A student carries extinguished a trained apparition on an LED. She initially determineds up the tour semblancen
below. She can meaunfailing the voltage athwart the diode and the resistor as polite as the EMF
supplied by the unsteady DC agency grant, giving an I-V graph ce the diode (view underneath).
The frivolous extinguishedput increases as the ceward general, IF, through the LED increases.
IF
A
A
R=500 ?
5
The general IF in the tour is 150 mA. Proportion the voltage fintegral athwart the resistor.
Formula and regards required
(2 vestiges)
V
6
Proportion the voltage of the grant.
Formula and regards required
(2 vestiges)
V
7
Audio CDs are scanned by laser frivolous. The reflected frivolous is descryed by a photodiode. A
practicable tour is semblancen underneath fit. The discrepancy in photodiode general as a agency of
frivolous ardor is semblancen underneath left.

°
30
photodiode
current
(?A)
20
°
photodiode
10
VOUT
R = 200 ?
50
150
°
250
frivolous ardor (lux)
When frivolous falls on the photodiode the extinguishedput voltage VOUT is 6.0mV. What is the ardor
of the frivolous, in lux, that is surprising the photodiode? Connectable attributable attributable attributable attributable attributablee: the phototdiode general is
proportional to the frivolous ardor.
Formula and regards required
(2 vestiges)
lux
The superveneing is a phototransistor (PT) tour. The frivolous is easily-under upon the low region
of the PT and produces a collector general IC.
IC
RC
10V
PT
VOUT
8
When frivolous of ardor 100 lux falls on the PT a general of 1.0?A careers in the tour and
the extinguishedput voltage VOUT = 4.0V. What is the appreciate of RC in M??
Formula and regards required
(2 vestiges)
M?
The frivolous ardor is qualifyd, and the extinguishedput voltage VOUT is now 7.0V.
9 What is the appreciate, in lux, of this upstart frivolous ardor?
Formula and regards required
(3 vestiges)
lux
The tour underneath is authenticationd to descry a customer as they invade and liberty a provision by walking through
a frivolous radiate. The frivolous beginning is a frivolous-emitting diode (LED), and the frivolous sensor is a frivolousdependent resistor (LDR). The 11V agency grant utters a general of 3.0mA.
I=3.0mA
R = 5.0k?
11V
R=1.0k?
ILDR
The properitys of the LDR are semblancen on the direct page.
A butterspeed happens to speed through the provision door and momentarily breaks the frivolous radiate. The
easily-under frivolous ardor at the LDR is 10 lux.
10 Proportion the generalILDR. , in mA, in the LDR tour.
Formula and regards required
(2 vestiges)
mA
11 Proportion the hindrance of the LEDthat gave mollify to the frivolous radiate.
Formula and regards required
(3 vestiges)
?

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