Physics P1 Flashcards
What is ionising radiation
Radiation that knocks off electrons
What is activity and count rate and units
Activity the rate of decay (how often it decays) becquerels Bq
Count rate the amount of radiation detected
Different types of specific latent heat
Specific latent heat of fusion (solid to liquid)
Specific latent heat of vaporisation(liquid to gas)
How does more volume link to pressure
Gas particles more spread out
Collide less frequent with wall
So less average force on the wall
And pressure is the total force on an area
What does a coulomb measure and its units
Coulomb measured the amount of charge given. 1 Coulomb is 6,250,000,000,000,000,000 electrons transferred. Units C
Circuit symbols for LDR, Thermistor, variable resister
LDR—- Resistor with circle around it with two arrow going towards
Thermistor—–Resistor with a horizontal then 45° line going through it (line represents temperature graph)
Variable resistor——Resistor with slanted arrow going through it(arrow represents changable value)
Resistance in parallel and series circuit
Resistance adds up in series circuit because Pd is shared between them so the current across the resisters is lower but current is the same in the entire circuit so the overall current decreases
Resistance in parallel circuit is less than the smallest resistor
Purpose of each wire in mains
Brown live provides 230v
Blue neutral 0v completes the circuit
Green and yellow is ground 0v unless short circuits so the current gets taken way to the ground cause least resistance
What are the 8 energy stores
Chemical ,kinetic, grav potential, elastic, thermal, magnetic, electrostatic, nuclear
4 ways energy transfers
Element change during alpha and beta decay
Alpha 2 proton and neutron get released decreasing mass by 4 and atomic number by 2
Beta decay a neutron turns to proton and an electron is released meaning weight doesn’t change but atomic number increases by one
What direction does current flow and what direction does electrons flow
charge flows from positive to negative
Electrons flow from negative to positive
What does a step up and step down transformer do
step up increases voltage less turns in primary coil
Step down decreases voltage more terns in primary
think Coil and Current are proportional in primary coil
what shows the strength of electric field
Distance of arrow from each other more arrows on surface then stronger that’s why arrows spread out further you go
What causes spark
high enough Pd between charged object and earth(0v) causes strong electric field causing air particles to loose electrons and ionise making them good conductors for the current to jump
