Trainee questions to answer

[Sintra]

The 12V looks to be the drop across R2

 

[matt1386]

Correct stu !

Well done mate !

Sorry if the drawing was not clear enough, thats just how the tutor at college had drawn it on the board so I copied it

Have you got a question to put up for the rest of us ?

Cheers

 

[Marvo]

Right then, i was thinking of the circuit as being in series which is all ive seen so far so i thought the current was common but since its in parallel (which i have been reading up on all yesterday!) its the voltage that is common so i can use the 12v drop across R2 to give me the current at R1... so 12v / 4ohms = 3amps through R1

R1 + R2 = 5.4amps at R3

So the voltage drop across R3 is 5.4amps x 6ohms which is 32.4volts (hopefully!)

Yep, spot on.

Your turn to post a question

 

[pennychew]

Correct stu !

Well done mate !

Sorry if the drawing was not clear enough, thats just how the tutor at college had drawn it on the board so I copied it

Have you got a question to put up for the rest of us ?

Cheers

Thanks! i'm looking for a question to post up now.

 

[pennychew]

A question on resistivity as thats we have just been doing...

In the following exercise take the resistivity of copper as 1.78 x10-8 Ωm.

Find the cross sectional area of a copper conductor 42m long which carries a current of 36A with a voltage drop of 2.69v.

 

[matt1386]

Hmm.. we have only just started looking at this the other night so dont think ill be able to get this one just yet, will have a read of my notes though and see if I can work it out ( doubt it though lol )

 

[Silly Sausage]

.... see if I can work it out ( doubt it though lol )

We'll have none of that attitude, thank you very much!

 

[pennychew]

Hmm.. we have only just started looking at this the other night so dont think ill be able to get this one just yet, will have a read of my notes though and see if I can work it out ( doubt it though lol )

I found that one a bit tricky when we did these at college, if you struggle with it i can post up one of the example equations that we were given before we started the exercise as these were a real help when we were left to get one with questions.

Stu

 

[matt1386]

I found that one a bit tricky when we did these at college, if you struggle with it i can post up one of the example equations that we were given before we started the exercise as these were a real help when we were left to get one with questions.

Stu

That would be much appreciated mate as im not sure how to work this one out

Cheers

 

[pennychew]

That would be much appreciated mate as im not sure how to work this one out

Cheers

Not a problem... im sitting nervously trying to fill the time in til the derby kicks off, Sunderland v Newcastle at 13:30!!



Had to do a screen grab as it wouldnt let me copy and paste

 

[matt1386]

Thanks mate ill have a go shortly

Yes me too, got a few quid on newcastle to win this one, fingers crossed !

 

[matt1386]

great start, NOT !! lol

 

[pennychew]

great start, NOT !! lol

Theres time yet but my advice to you before the game would have been never ever bet on newcastle, they will always let you down!

 

[jimmyray]

Hi pennychew, we've just started this at college, so I'll give it a go! Is the answer 10mm2 cross sectional area? Cheers. Jim

 

[pennychew]

Hi pennychew, we've just started this at college, so I'll give it a go! Is the answer 10mm2 cross sectional area? Cheers. Jim

Hi mate, thats spot on!

Do you have a question to put up?