Trainee Spark needs help

[SPARKED OUT]

CAN ANYBODY PUT ME ONTO SOME REVISION SITES,I HAVE MY FIRST YEAR2360PART 1 EXAMS COMING UP PRETTY SOON AND I COULD DO WITH SOME QUIZ'S ON IT .........THANX A LOT

 

[Big_Spark]

Capitals are SHOUTING online, try to use the caps lock in the other position.

In the meantime try this.

A 10 ohm resister is connected in parallel with a 15 ohm resistor and the combination is connected in series with a 12 ohm resister. The equivilent resistance of the circuit is?

A) 37 ohms
B) 18 ohms
C) 27 Ohms
D) 4 Ohms

Also:

If a circuit has a voltage of 5V and an ammeter records a current of 25mA, what is the resistance of the circuit?

 

[SPARKED OUT]

Sorry about the capitals....here go's

question 1 is it 18 ohms
question 2 is it 200 ohms

 

[Big_Spark]

Sorry about the capitals....here go's

question 1 is it 18 ohms
question 2 is it 200 ohms

Your right on both counts

When I have time I'll post a couple more I can think of.

 

[AdamW]

This could be pretty fun! Perhaps some capacitor and inductor questions next?

 

[Big_Spark]

OK, to keep Adam happy too, try this one Guys,

1:Capacitance

(a) Determine the energy stored in a 3 micro-Farad TiO Capacitor when charged to 400V.?

(b) Also determine the average power developed if this energy is discharged in a time of 10 micro-seconds?

2: Magnetism.

A magnetising force of 8000A/m is applied to a circular magnetic circuit of mean diameter of 30cm by passing a current through a coil wire wound on the circuit.

If the coil is uniformly wound around the circuit and it has a total of 750 turns, determine the current flowing through the coil.

 

[SPARKED OUT]

Hey guys take it easy i'm only in my 1st year not done much on those 2,anymore greatly appreciated

cheers fwl.........keep it simple for now.


i will try though!

 

[Big_Spark]

Hey Sparked..they must have watered down part 1 from when I was an apprentice, I took these questions from my old college work for part 1 exam prep work!!

It was lazyness as I couldn't be arsed to work out a new question from scratch..I'll do it now though and make them a little easier. Sorry

 

[SPARKED OUT]

FWL, Thanx for replying just got a book on magnetism to-nite of a friend
I will read up on it this week.

I do 2 nights a week on a fast track course 1 theory 1 practical, my sister who is a bit of a whiz at maths is brushing my skills up on that side ,
but any future help is greatly appreciated,formulas were a bit of a pain but i got a ohms chart of the net which helps me.

 

[Big_Spark]

When I was an apprentice we did one month at college followed by one month on site, and part One took a full year.

How the industry is suffering!!

That is not a dig at you Sparked..I'll be whatever help I am able to be.

 

[Scoby_Beasley]

Nice to see someone making an effort for a change sparked

 

[SPARKED OUT]

FWL the answers you set me earlier are they

1a 7.5*10-9j

b 7.5*10-4


2 magnetism question.........320amp

 

[Big_Spark]

FWL the answers you set me earlier are they

1a 7.5*10-9j

b 7.5*10-4


2 magnetism question.........320amp

Erm..how can I put this..NO on both counts, way off.

Energy in the capacitor:

w=1/2CV*2 = 1/2(3x10*6)400*2 = 3/2x16x10*-2 = 0.24 Joules

Power = energy/time = 0.24/10x10*-6 w = 24kW

The answer to the magnetism is.

I-=hl/N = 8000(Piex30x10*-2)/750 = 10.05A

 

[ban-all-sheds]

Ok - well here's one which will be dear to FWL's heart:

Assuming a Ze of 0.8ohms, what is the maximum length of a 4mm ring main cable, installation method 1, that will allow you to meet the 0.4s disconnect time with a 30A BS3036 fuse?

 

[Big_Spark]

Ok - well here's one which will be dear to FWL's heart:

Assuming a Ze of 0.8ohms, what is the maximum length of a 4mm ring main cable, installation method 1, that will allow you to meet the 0.4s disconnect time with a 30A BS3036 fuse?

You might want to refrase that question...and no I don't mean the comment about me either