# Mammoth Physics Index

- Misc
- --New Item--
- A
- Acceleration
- A copper wire
- Alternative gas laws mnemonic
- Alternative method to remember Ohm's law
- An electric coil between two magnets
- Angle of incidence and angle of refraction
- Approximate ways to find the principal focal length
- Armature
- B
- Boyles law
- Boyles law in use
- Broken pencil
- Brushless DC motor
- C
- Can a real image be seen with the naked eye?
- Can I keep cutting a magnet in half?
- Causing an electrical current in a solenoid
- Charles law
- Charles law in use
- Concave lens
- Concave lens: Principal focal length – be careful
- Concave lens and objects larger than the lens
- Concave lenses – Centre of curvature
- Concave lenses – What can your eye see
- Concave lens use – Galileo's telescope
- Concave lens use – Glasses
- Concave lens use – Peephole or door viewer or spy hole
- Concave lens – Object at different distances from the lens
- Concave lens – Object passes through principal axis
- Concave lens – One point many rays
- Concave lens – Principal axis
- Concave lens – Principal focal length
- Concave lens – Principal focal point (two of them)
- Concave lens – Radius of curvature (R)
- Convergent rays of light - Convex lens
- Convex and concave, hyperopia and myopia
- Convex lens
- Convex lens - Object at 2F
- Convex lens - Object at F
- Convex lens - Object at more than 2F
- Convex lens - Object between 2F and F
- Convex lens - Object between lens and F
- Convex lens and objects larger than the lens
- Convex lenses - What to do in an exam
- Convex lenses and centre of curvature
- Convex lenses and the lens equation
- Convex lens principal axis
- Convex lens radius of curvature (R)
- Convex lens use - Binoculars
- Convex lens use - Glasses
- Convex lens use - Magnifying glass
- Convex lens use - Microscope
- Convex lens use - Telescope
- Convex lens uses - Camera
- Copper atoms
- Creating a compass from a magnet
- Creating alternating current (AC)
- Creating direct current (DC)
- Current
- D
- Define electromagnetism
- Define motor
- Density
- Detailed magnetic field around a solenoid
- Detailed magnetic field of a wire between two opposing magnetic poles
- Diamonds and total internal reflection
- Different refractive indices
- Divergent rays of light – Concave lens
- Do both poles of a magnet attract a paperclip?
- Do iron filings stick to wires?
- Drop a magnet through a solenoid
- Dynamo – recall the meaning
- E
- Earth's magnetic field and compasses
- Electrical charge
- Electrical energy
- Electrical power
- Electric commutator – definition
- Electricity as water
- Examples using lens equation
- Eye lens changes
- F
- Fleming's left-hand rule
- Fleming's left-hand rule: the mnemonic picture
- Fleming's left-hand rule and Fleming's right-hand rule

- Fleming's right-hand rule (induction)
- Fleming's right-hand rule: the mnemonic picture
- Force
- G
- Galvanometer
- Galvanometer
- Gas law constants
- Gay-Lussac's law
- Gay-Lussac's law in use
- Generating higher voltage or current
- Generator
- Generator devices
- Gravitational potential energy
- H
- Have you got a magnet?
- Hertz
- How to change an electric coil into a motor
- How to demagnetise a magnet
- How to enable a wire to keep rotating
- How to find the critical angle in an experiment
- How to make an electromagnet
- How to make a simple electric motor
- How to make the motor turn the other way
- How to remember + or -
- How to remember myopia and hyperopia
- Hyperopia and correction
- I
- Increase the force of the motor
- Inducing an electric current in a single loop
- K
- Kinetic energy
- L
- Learn the word induction
- Lens equation – Concave lens
- Lens equation – Concave lens and examples
- Lenz's law definition
- Light box and oblique parallel rays
- Light box and oblique parallel rays – Concave lens
- Light passing through a glass brick
- M
- Magnets attract or repel
- Magnets create electricity
- Manufacturing permanent magnets
- Medical uses of optical fibres
- Metals – a sea of electrons
- Method for drawing ray diagrams - convex lens
- Method for drawing ray diagrams – Concave lens
- Most efficient way to transmit 1 KVA
- Motor effect
- Myopia and correction
- Myopia and hyperopia - (short and long sight)
- N
- Newton's first law - examples
- Newton's laws of motion mnemonic
- Newton's laws of motion questions and answers
- Newton's second law - examples
- Newton's third law - examples
- Newton's three laws of motion
- Normal line - Convex lens
- Normal line - Flat surfaces
- Normal line – Concave lens
- O
- Object distance and image distance
- Object distance and image distance – Concave lens
- Object passes through principal axis
- Ohm's law
- One point many rays
- One wire vs multiple wires (induction)
- Other forms of Newton's laws
- P
- Part reflection part refraction
- Path of a single electron
- Path of the +ve charge
- Physics formulas
- Plotting all the magnet and solenoid wire configurations
- Power
- Practical ways to find focal length – Concave lens light box
- Practical ways to find the principal focal length light - box
- Practical ways to find the principal focal length magnifying glasses
- Practical ways to find the principal focal length of a concave lens using a convex lens
- Practical ways to find the principal focus length – Pins
- Practical ways ways to find the principal focal length - lens equation
- Pressure
- Principal focal length
- Principal focal length and centre of curvature
- Principal focal length be careful
- Principal focal length of an eye and power
- Principal focal point (two of them)

- Principal focal point and refractive index
- Principal focus point and refractive index (`n`)
- Proving which way magnetic lines on a magnet travel
- R
- Real images versus virtual images - convex lens
- Real images versus virtual images – Concave lens
- Refraction - water or glass to air
- Refraction air to water or glass
- Refraction and convex lenses
- Refraction and spearing a fish
- Refraction and spitting fish
- Refraction and straws
- Refraction concave lens
- Refraction definition
- Refraction Mnemonic
- Refraction use - Bicycle reflectors
- Remember which way magnetic field lines on a magnet travel
- Resistance
- Rough surfaces
- Rough surfaces
- S
- Section through a wire: electric flow convention
- Simple electrical circuits
- Small critical angle
- Snell's law
- Snell's law applies to velocity
- Snell's law in use
- Snell's law is a ratio
- Spelling principal and lens
- Spinning a magnet inside a coil of wire
- Step up or step down transformer
- Strength of an electromagnet (larger battery)
- Strength of an electromagnet (number of coils)
- Summary
- Summary
- Summary myopia and hyperopia
- Summary ray diagrams
- T
- The A.C./D.C. wars
- The difference between an ammeter and galvanometer
- The difference between an ammeter and galvanometer
- The difference between an electromagnet and a solenoid
- The eye - Like a camera
- The Gas Laws
- The right-hand grip rule of electromagnetism
- To remember Ohm's law
- To remember resistance is measured in ohms
- Total internal reflection - slow to fast
- Total internal reflection experiments and optical fibres
- Transformer
- Transformer - changing the number of turns
- Transformer - Energy can not be lost or gained
- Transformer - Summary of formulas
- Transformer examples
- Two batteries in parallel
- Two batteries in series
- U
- Uses of electromagnetism
- Using a commutator
- Using a shaft to drive a wheel
- V
- Voltage
- Voltage
- W
- Wave speed
- Weight
- What's happening inside a copper wire
- What do the colours in a plug mean?
- What is electricity
- What were the old UK wiring colours?
- What would happen if the magnets were turned upside down?
- What would happen if you moved the wire from north to south pole?
- What would happen to the rod if both the current and the magnetic field were reversed?
- What would happen to the rod if the current were reversed?
- What would happen to the rod if the magnetic field was stronger?
- What would happen to the rod if the magnet was turned upside down?
- What would happen to the rod if the wire was moved in the opposite direction?
- Where do the cables go in the plug?
- Which end of an electromagnet is north
- Which is the principal focal divergent point?
- Which is the principal focus (convergence) point
- Which way does a compass point in an electromagnetic field with one wire?
- Which way does electricity flow?
- Why this colour combination?
- Why total internal reflection is always slow to fast
- Wiring a UK plug
- Work done
- Working out the critical angle