P3 Flashcards
What is focal length
Distance centre of lens to focus
What does the cornea do
Refracts light
What does pupil do
Adjusts light intensity
What is a moment
Turning effect of a force
If an object is not moving what is happening in terms of momentum
Total anticlockwise = total clockwise meaning there’s no resultant force
When will an object fall
Line if action moves outside of base
Resultant moment
Law of moments
What is the motor effect
Force of a current carrying wire experiences in a mag field
How does the motor effect occur
When current passes through wire = mag field
This interacts with the mag field of magnet
= a resultant force produce ( usually meaning it’s thrown out!!)
Describe how a loudspeaker works
Current flowing through wire = creates mag field
This interacts with the permed ant magnetic field of magnet
= resultant force
Uses ac = direction of resultant force changes
Features of switch mode transformer
Lighter
Smaller
Mobile phones
More efficient
What parts of transformer are made of what
Soft iron core
Coils = electrical conductor + covered in plastic
What are the following features in a camera ?
Cornea/lens
Retina
Pupil
Lens
CCD
Aperture
Features of a converging lens
Conveys
Real
Inverted
