Practicals you need to know thread... (1 Viewer)

[JizZ]

heres the M&G ones ive got on a sheet:

Motor Effect
- Wire between 2 bar magnets.
- Apply potential difference on and off across wire.

Generation of Current
- Connect solenoid to galvanometer
- Move bar magnet, notice any movement of needle.

Varying Distance/Strength/Motion of magnet and coil
- Distance: Move bar magnet along a ruler flat down against coil. Then do it with ruler standing vertical.
- Strength: Different magnets
- Motion: Different speeds, directions, polarities

Producing AC
- Put magnet vertical on table
- Connect a solenoid to a centre-reading galvanometer
- Move coil up and down over magnet, observe needle as it goes up/down.

Transformer
- Wind 2 seperate insulated coils onto iron ring. Connect to seperate circuits.
- Connect one coil to AC power supply. The other to a multimeter.
- Check induced voltage in second coil, calculate Vin/Vout ratio compare with number of coils

AC Induction Motor
- Get a flat aluminium disc, pass a thread through the middle so it hangs horizontally.
- Attatch a bar magnet to the end of a pencil to make a 'T'.
- Attatch pencil to hand drill, and rotate under disc.
- Vary speeds, discs, magnets, etc..

 

[ND]

Originally posted by Takuya
Used an induction coil to create sparking across some apparatus, then turned on a radio in the room and listened to interference.

A 2 mark question at the most

How did you know which frequency to tune the radio to?

 

[ND]

Originally posted by Takuya
And that's the practical?

Yep, the wire moves because of the motor effect.

 

[Takuya]

Originally posted by ND
How did you know which frequency to tune the radio to?

hehe it didn't matter...

 

[ND]

So you just had it on a random station, then when the gap sparked, there was a small interference?

 

[Inhuman]

no you have to put it between stations. you can hear static when the coil sparks

 

[Takuya]

lol you could still hear the interference when it was on 105.7FM

Just spent the whole time playing around with the induction coil and sparking thing and the radio...

BTW does anyone know what the sparking thing is that you attach to the induction coil? It's not the same as Hertz', but does the same thing effectively.

 

[parry]

oh ok, thanks takuya