Karteikarten
Paper 2 PAGs
Karten in diesem Stapel (14)
- 1Give a list of all equipment needed for PAG 6.1 - determine plank’s constant● Light emitting diodes of varying colours
● Ammeter
● Voltmeter
● Leads
● Cell
● Resistor - 2Give a list of all equipment needed for PAG 11.1 - investigating transformers● 2 C cores (laminated iron cores in a C shape) primary and secondary
● Wire
● Low voltage AC supply
● 2 voltmeters
● 2 ammeters
● Variable resistor - 3Give a list of all equipment needed for PAG 11.3 - Determining the uniform magnetic flux density between the poles of a magnet using a current-carrying wire and digital balance● Wire
● 2 stands with clamps
● 2 identical magnadur magnets (magnetised along long face)
● Mass balance
● Ammeter
● Power pack
● Ruler - 4Describe the method for PAG 6.1 - determining plank’s constantSet up the circuit, & Find the λ of light either on the packaging online. Find the threshold voltage of it by recording the pd across it at which it lights up/current is shown to be flowing by the ammeter. Find the threshold voltage for a range of LEDs of different λ & record these in a table of λ against threshold voltage.
- 5Describe the method for PAG 11.1 - investigating trasnformersPut 2 cores 2gether,wrap 1:2 ratio of turns on P & S coils.Add Vmtr on both coils, add P coil to low voltage AC supply.Turn on AC supply,record V on each coil.Keep same AC supply, repeat w/ different turn ratios.add vresistor to P coil circuit & amtr 2 both.Keep No. of turns constant, turn on power & record Vs & Is 4 range of input Is.
- 6Describe the method for PAG 11.3 - Determining the uniform magnetic flux density between the poles of a magnet using a current-carrying wire and digital balanceWith no current flowing, zero the balance. Change supply voltage so that current flowing through the wire is 6 A. Record mass & repeat for I = 5, 4, 3, 2 & 1 A.repeat experiment to get 2nd set of results. measure the length of the magnadur magnets. (length of wire in the magnetic field).
- 7Describe the calculations for PAG 6.1 - determining plank's constantPlot graph of threshold voltage (V) against 1/λ & calculate gradient. The energy of the photons emitted have energy E = hf = hc/λ & E = eV where V is
the potential difference, combine to give hc / λ = e V. Multiply both sides by λ and divide by e to get hc / e = V λ .times gradient Vλ by e/c to find planck constant - 8Describe the calculations for PAG 11.1 - investigating transformers4 turn ratios, divide number of turns on sec coil (Ns ) by number on pri (Np ) . Calculate ratio in voltage across sec coil (Vs ) to voltage across pri(Vp). finding that Ns / Np = Vs / Vp . 4 current, should find that Ns / Np = Vs / Vp = Ip / Is . efficiency of transformer can be found using circuit w/ ammeters w/ formula e = Is V s / Ip V p
- 9Describe the calculations for PAG 11.3 - Determining the uniform magnetic flux density between the poles of a magnet using a current-carrying wire and digital balanceFind the mean reading of mass for each current. Plot graph of mean m against I. Draw line of best fit through & calculate the gradient. The force on wire is F = BIL. This equals the force found from the balance reading where F = mg/1000 . Hence BIL = mg/1000 & B = mg / I L×1000. The gradient is m/I so B = gradient × L×1000
- 10How do you set up the equiptment for PAG 11.3Set up wire so it’s between faces of the magnets & wire & magnets are on top of balance. ammeter & power pack should be part of the complete circuit.
- 11Give a safely point for PAG 11.3When using magnets, students with pacemakers should not be near the magnets as
they can interfere with their pacemaker’s function. - 12Give a safely point for PAG 11.1As transformers increase voltage use a low input voltage to keep it at a safe level.
- 13Why may the formulas used in PAG 11.1 not be Very accurate, and how can it be improvedLess accurate as transformer isn’t 100% efficient, 2 increase efficiency, Use laminated core to reduce energy loss by eddy current, Use low resistance thick copper wire 4 coils, Use magnetically soft material so less energy needed 2 magnetise & demagnetise core
- 14For PAG 6.1 how can you make sure you’re getting the most accurate line of best fit?● Use a wide range of wavelength LEDs and take repeats to draw the most accurate line of best fit.
Informationen
- Beschreibung
- PAGs 6.1, 11.1, 11.3
- Erstellt von
- lizabeth rawson · Mai 2022
- Aktualisiert
- 28 Mai 2022
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