# Physics task:Must show all a working and formulas.

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PART 1: DIODES
Yenka distillation: General in Diodes
City planners accept to infer how best to guard commerce affecting to free movables to homes and
businesses served by roads. Abundant cities now accept individual-way streets to restrain where vehicles
can go. Diodes consummate a correspondent character in an electric tour.
Task 1: General in a diode
Model 1
1. Referable attributable attributableorious the Yenka distillation week 9 polish Diodes_model1.cxp.
2. Truth the switches to move on each of the tours. Remark any general arrows.
3. Bestow span contrarietys among the primitive span tours.
4. The ultimate span tours truth an alternating general fount. How abundant intervals does each of
the bulbs in the ultimate span tours scintillate in individual exact? Elucidate the contrariety.
A diode strikes as a individual-way street ce general. When it is conjoined with the arrow
symbol pointing far from the more assuflushed final, electrons can career through the
diode causing a general.
Task 2: A serviceable impression of diodes
1. Referable attributable attributableorious the Yenka distillation week 9 polish Diodes_model2.cxp.
2. Shape unquestioning you accept the graph palpable and move on the switch ce the primitive tour.
Remark the general graph. Portray the tour and the graph under.
Circuit
Graph (vestige axes)
3. Repeat 2 ce the relieve tour. What is the contrariety? Why?
Portray the tour and the graph under.
Circuit
Graph (vestige axes)
4. Repeat 2 ce the ultimate tour. How does it parallel with the other span? What is the
serviceable representation to ghost competency of this ordainment?
Portray the tour and the graph under.
Circuit
Graph (vestige axes)
5. Truth your finger to delineate the general from the head of the voltage contribute, through the
diodes, through the resistor and tail to the groundproduction of the contribute. Then supervene it tail
amould as the general reverses. On your coercemer tour diagram pretext the address of
general careers in facing addresss through the tour using arrows of span different
colours. Remember the diodes strike as individual-way streets ce general. Why would this
ordainment be actual ce a expedient that truths frequented general?
A unmarried diode produces half-prosper reinstatement when truthd with an AC assignableable. The
third tour truths diodes in an ordainment that bestows liberal prosper reinstatement. When
used with a capacitor, aliberal prosper rectifier can get a DC contribute from an AC
source.
PHYSICS QUESTIONS: DIODES
Bestow responses to 2 coercioncible delineations
Infer the tour pretextn under to response Questions 1 ? 4.
30?
60V
60?
40?
50?
1
Consider the serviceable opposition of this tour.
Equivalent tour diagram vigilances
(2 vestiges)
?
2
Consider the general in each of the impure resistors pretextn over.
Pretext whole cemula(s) and vigilances
(2 vestiges)
I30A
I40A
I50A
I60A
3
Consider the voltage descend opposing each resistor. Response on present page
Pretext whole cemula(s) and vigilances
(2 vestiges)
V30
V
V40
V
4
Consider the whole compressiveness wild in this tour.
Pretext whole cemula(s) and vigilances
V50
V
V60
V
(2 vestiges)
W
Questions 5-7 connect to the superveneing instruction.
You accept a battery, impure 3? resistors and a switch. How would you group the resistors to bestow a whole
serviceable opposition of:
5
0.75?
Tour diagram vigilance required
6
4?
Tour diagram vigilance required
7
(1 vestige)
(2 vestiges)
7.5?
Tour diagram vigilance required
(2 vestiges)
Questions 8 ? 14 connect to the superveneing span graphs.
A diode and a buoyant sphere accept I-V personalitys pretextn in the delineations under:
The diode and buoyant sphere are conjoined to a 2.0 V DC fount as pretextn in the diagram
below.
8
9
Does the sphere buoyant up? Yes or No.
(1 vestige)
Response either Question 10 or 11 under, depending on your response to Question 9 over.
If sphere does buoyant up, consider the general ? in mA ? that careers in the sphere.
Include an exposition and vigilances
(1 vestige)
mA
10
If sphere doesreferable buoyant up, elucidate why assignable.
(1 vestige)
The diode and buoyant sphere are now conjoined as pretextn under. Assignablee that the fantastic battery
voltage has been increased to 2.3 volts DC.
2.3V DC
11
12
Does the sphere buoyant up? Yes or No.
(1 vestige)
Response either Question 13 or 14 under, depending on your response to Questions 12 over.
If sphere buoyants up, consider the general ? in mA ? that careers in the sphere.
Include exposition and vigilances Response in mA(1 vestige)
mA
13
If sphere does assignable buoyant up, elucidate why assignable.
(1 vestige)
14
The 2.3V DC fount is now replaced with a subdued quantity AC fount. What do you
Remark exposition required.
(2 vestiges)
Observation:
Explanation:
Questions 15 -17 connect to the superveneing graph.
A thermistor is a expedient the opposition of which varies with air. The oppositionair personality ce a thermistor is pretextn under.
15
What is the prize of the opposition of the thermistor at 20?C?
Response required.
(1mark)
?
The thermistor is incorporated into the restrain tour ce the subsidence keep-akeep-apart of a coolroom
the tour is pretextn under.
The recruitment switches the subsidence keep-akeep-apart ON when voltage, V, opposing wavering resistor R?4V
and switches OFF when V < 4 V. The subsidence keep-akeep-apart must move on when the air of the coolroom fuses to, or exceeds, 5?C. 16 At what prize should wavering resistor R be firm so that the subsidence moves on at this temperature? Formula and vigilances required. (2 vestiges) ? 17 The coolroom is assignable apathetic sufficient. To firm the air subdueder, should R be increased or decreased? Elucidate your response. Exposition required. (3 vestiges) PART 2: AMPLIFIERS Yenka distillation: TheAmplifier Notorious Yenka. Click onFantastic Model. From the Keep-aparts Library (on the left of mitigate) click on Electronics, Analogue. Pull the superveneing ingredients pretextn under on to the assumption window: Compressiveness victuals (Zero volt reprimand), Passive ingredients (resistors ?2), Assignableable Generators (Signal generator), Integrated tours (741 Operational amplifier), Meters (Voltmeter). Click on each ingredient to move it if requiflushed (a smwhole dispersion should exhibition over the ingredient).Clickon the notable generator to selecteded it, and shift the quantity to 0.1 Hz and the peak voltage to 2 volts in the properties pane that exhibitions to the left of the productionspaceSave your polish as you go along! To wire ingredients coincidently, click and pull with your mouse. Connect to the Help menu if you are assignable unquestioning what to do here. Save your polish! From the Keep-aparts Library click Presentation and pull the Graph icon onto the assumption window. Click and pull on the Target cat's-paw present to the flushed scatter on the graph keep-akeep-apart so that a scatteblushing verse connects the cat's-paw to the assignableable generator of the tour. It connects when the verse goes sound (to pretext that an association has been made). Release the motruth dot. The verse now moves a flushed-dashed colour. Click on the graph pane and go to Delineates in the graph window at left and shape unquestioning that this is Delineate 1 and Red. Click on Delineate 2 in the descend down menu. Tick the Pretext Delineate smack. It should be blue-colored-colored. Another Target cat's-paw should exhibition in the graph window. Repeat the over process ce the Target cat's-paw but this interval pull the cat's-paw to the voltmeter. This should be a blue-colored-colored-dashed colour. Save your polish! Click on Property... proportioned to the left of the Y-axis on the graph and appropriate Voltage from the schedule that appears ce twain Target cat's-paws. Selecteded the graph and referable attributable attributableorious the Properties pane. Referable attributable attributableorious the Y-axis individuality and firm the Min. and Max. prizes to -10 and 10V. Referable attributable attributableorious the X-axis individuality and firm the Min. and Max. values to 0 and 50s. Span delineates should exhibition on your graph. Save your polish! Feedback resistor Click if deficiency to re-start the graph Yenka distillation: Transistor Amplifier Question 1 Copy the span delineates from your Yenka graph. You should accept a flushed delineate and a blue-colored-colored-coloblushing delineate.Clearly vestige and reckon your axes and delineates. Question 2 Is this an inverting or a non-inverting amplifier? Elucidate your response. What is the voltage mould of this amplifier? Question 3 Shift the prize of the feedtail resistor to consummate the zenith voltage mould ce this keep-aparticular amplifier. Portray the graphs and transcribe the feedtail resistor prize. Question 4 Shift the prize of the feedtail resistor to remark the clipping of the extinguishedput voltage. Portray the graph and transcribe the feedtail resistor prize. PHYSICS QUESTIONS: AMPLIFIERS A smwhole voltage amplifier has the transplant personality pretextn under. VOUT VIN 1 Consider the versear mould of the amplifier (concretion and proof) and declare whether this amplifier is inverting or non-inverting. Formula and vigilance required. (2 marks) Direct Mould Mag Sign Inverting / Noninverting A 2.0Vp-p (?1.0V) AC input assignableable is applied to the amplifier as pretextn under. V Input assignableable (Volts) 5 4 3 2 1 ? 1 3 6 9 t (s) interval (ms) ? 2 ? 3 ? 4 ? 5 2 On the graph over pull the extinguishedput AC assignableable. marks) (2 Questions 3-7 connect to the superveneing instruction. A unmarried character npn transistor amplifier and its transplant personality are pretextn on the present page. The transistor is suitably particular. ? ? ? R1 ? ? VIN VOUT VR2 R2 ? ? Vextinguished (V) 10 0 0.8 3 What are the DC input and extinguishedput biasing voltages? Biasing Input Voltage 4 V (2 vestiges) Biasing Extinguishedput Voltage What are zenith and stint possible extinguishedput voltages? Min: 5 Vin (V) 1.8 V What is the prize of R2 when R1 is 10k?? Formula and vigilances required. marks) Max: V (2 vestiges) V (3 ? A 1.6Vp-p (?0.8V) AC input assignableable VIN is now applied to the transistor as pretextn under. VIN (V) 0.8 2 4 6 8 t (ms) -0.8 6 On the axes under portray the AC input assignableable succeeding biasing when a 1.6Vp-p (?0.8V) AC input assignableable is applied. Biasing voltage graph palpably numbeflushed axes(2 vestiges) VIN succeeding biasing (V) 2 4 6 8 t (ms) 7 On the axes under portray the AC extinguishedput assignableable (look tour diagram) when an AC input notable VINof 1.6Vp-p (?0.8V) is applied.Comment on the character of the assignableable. Complete Graph. Palpably numbeflushed Y-axis
(3 vestiges)
VOUT
(V)
2
4
6
8
t (ms)
Comment on assignableable
8
9
What is leanness?
Exposition required
(2 vestiges)
Describe the bark movables in copper wires and elucidate why it occurs?
Exposition required
(3 vestiges)
10 Elucidate why the buoyant assignableables in optical fibres are assignable abnormal by the bark movables?
Exposition required
(2 vestiges)
11 Parallel the instruction-carrying compressiveness of copper wires and optical fibres?
Exposition required
(2 vestiges)
MORE PHYSICS QUESTIONS
A tour using an LDR is pretextn under. The agricultural opposition R1 is 9.0k?.
10V
1
0
R1
VOUT
R
2
V
The LDR has the personalitys pretextn under. The oppositions on the Y-axis are in k?
Resistance
(k?)
Buoyant Concentration
(lux)
1
What succeed be the extinguishedput voltage VOUT when the buoyant concentration is 500 lux?
Formula and vigilance required
(2 vestiges)
V
2
It was unwavering to truth the tour over as a gloom buoyant, ie, a buoyant succeed switch on at VOUT
when the buoyant raze beyond decreases to a actual raze.
Succeed this tour production as a gloom buoyant? If so elucidate why it productions. If it does assignable production
elucidate why assignable and propose an opinion tour that succeed wholeow VOUT to move on.
Response exposition/tour diagram
(3 vestiges)
Does this tour production as a gloom buoyant?
Explanation:
A buoyant-emitting diode (LED) is a distinctive pattern of diode that emits buoyant when the general
is important than abextinguished 20mA. The delineation under pretexts the I-V personality ce an LED.
The LED is truthd in the tour pretextn under and is remarkd to gsubdued brightly. The 50?
resistor is middle to checkmate also capacious a general careering which capability detriment the LED.
3
Consider the possible contrariety opposing the 50? resistor, VYZ
Exposition and vigilances requiflushed in your solution
(2 vestiges)
V
4
What is the general, in milliamps, through the LED in the tour pretextn over?
Exposition and vigilances requiflushed in your solution
(2 vestiges)
V
A ward carries extinguished a serviceable distillation on an LED. She initially firms up the tour pretextn
below. She can meaunquestioning the voltage opposing the diode and the resistor as well-mannered-mannered as the EMF
supplied by the wavering DC compressiveness contribute, giving an I-V graph ce the diode (look under).
The buoyant 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. Consider the voltage descend opposing the resistor.
Formula and vigilances required
(2 vestiges)
V
6
Consider the voltage of the contribute.
Formula and vigilances required
(2 vestiges)
V
7
Audio CDs are scanned by laser buoyant. The reflected buoyant is unmasked by a photodiode. A
possible tour is pretextn under fair. The diversity in photodiode general as a character of
buoyant concentration is pretextn under left.

°
30
photodiode
current
(?A)
20
°
photodiode
10
VOUT
R = 200 ?
50
150
°
250
buoyant concentration (lux)
When buoyant falls on the photodiode the extinguishedput voltage VOUT is 6.0mV. What is the concentration
of the buoyant, in lux, that is impressive the photodiode? Assignablee: the phototdiode general is
proportional to the buoyant concentration.
Formula and vigilances required
(2 vestiges)
lux
The superveneing is a phototransistor (PT) tour. The buoyant is shining upon the disingenuous region
of the PT and produces a collector general IC.
IC
RC
10V
PT
VOUT
8
When buoyant of concentration 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 prize of RC in M??
Formula and vigilances required
(2 vestiges)
M?
The buoyant concentration is shiftd, and the extinguishedput voltage VOUT is now 7.0V.
9 What is the prize, in lux, of this fantastic buoyant concentration?
Formula and vigilances required
(3 vestiges)
lux
The tour under is truthd to unmask a customer as they penetrate and license a garner by walking through
a buoyant gleam. The buoyant fount is a buoyant-emitting diode (LED), and the buoyant sensor is a buoyantdependent resistor (LDR). The 11V compressiveness contribute frees a general of 3.0mA.
I=3.0mA
R = 5.0k?
11V
R=1.0k?
ILDR
The personalitys of the LDR are pretextn on the present page.
A buttervanish happens to vanish through the garner door and momentarily breaks the buoyant gleam. The
shining buoyant concentration at the LDR is 10 lux.
10 Consider the generalILDR. , in mA, in the LDR tour.
Formula and vigilances required
(2 vestiges)
mA
11 Consider the opposition of the LEDthat gave fuse to the buoyant gleam.
Formula and vigilances required
(3 vestiges)
?
Questions 1 to 3 rehearse to the superveneing instruction.
Delineation 1 pretexts the affinity of 6 particular resistors of unrecognized oppositions and a 10 V battery.
Denude has conjoined 4 ammeters and 1 voltmeter to the tour as pretextn. The ammeter A1 bestows a
lection of 40mA.
Question 1
What lection succeed denude remark on ammeters A2, A3 and A4?
Question 2
What is the prize of the whole opposition in the tour?
Question 3
What is the opposition of R3?

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