Questions for the Gurus

Submitted: Thursday, May 21, 2009 at 18:49

ThreadID: 69038 Views:2710 Replies:3 FollowUps:12

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Member - Kroozer (WA)

Righto, fairly basic lesson today kids. All i want you to do for me today is answer 2 simple questions and then you can go to recess.

Both questions are 12v questions, in relation to an automobiles electrical system.

You will be JUDGED on your answers, so please think it through and go over your answers before submitting. You have 5 mins per question get crackin.

Question 1: If i was to run a new power wire to my new spotlight relay (which has in built 25amp fuse) on Automobile A, do i still need to place a fuse along the new power wire? Even if the relay will be mounted no more then 30cm from battery, Will the fuse mounted relay be adequate?

Question 2: Automobile B has 2 12v power outlets and one cigarette lighter outlet. On the 2 power outlets it says maximum of 120w power through both outlets at same time. This equals only 10 amps through both outlets at same time. So if running a Waeco CF-35 at around 3 degrees celsius, and a Dick Smith Portable Oven both at same time off the 2 power outlets, would this exceed the 10amps?

I cant seem to find any real world power figures for the oven, but it is fused for 15amp, so even if i wasnt running the fridge i wouldnt be able to run it anyway if its anywhere near that figure.

Your time is up, please hand in your answers and go and grab a BEER. Cheers

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Reply By: Member - Footloose - Thursday, May 21, 2009 at 18:58

Thursday, May 21, 2009 at 18:58

1) yes and
2) yes.

AnswerID: 365994

Follow Up By: Lex M (Brisbane) - Thursday, May 21, 2009 at 19:10

Thursday, May 21, 2009 at 19:10

Here's a second opinion
1) yes
2) yes

FollowupID: 633739

Follow Up By: Member - Kroozer (WA) - Thursday, May 21, 2009 at 19:33

Thursday, May 21, 2009 at 19:33

Im sorry Footy, but i need some more info to your answers. Are you saying yes, i still need to fuse it or are you saying yes the relay fuse would be alright.

I would have thought that the fuse on the relay does the exact same thing as an inline fuse. And by placing it next to battery it would be exactly the same.

FollowupID: 633744

Follow Up By: Member - Footloose - Thursday, May 21, 2009 at 19:44

Thursday, May 21, 2009 at 19:44

Foory turns baseball cap sideways.

Yo dude, listenup yo !
Da fuze goes at da battery end, then doze lil lectron fellas can't go commitin no arson see!

Footy puts the cap on the right way again.

Your relay fuse is not exactly at the battery, is it. Any short on that short length of wire can cause a fire.

FollowupID: 633746

Follow Up By: Member - Kroozer (WA) - Thursday, May 21, 2009 at 20:06

Thursday, May 21, 2009 at 20:06

ROFLMAO, all you had to do was turn your hat around and then i could understand you. That really took me back to the school yard.

FollowupID: 633751

Follow Up By: Member - Footloose - Thursday, May 21, 2009 at 20:16

Thursday, May 21, 2009 at 20:16

Mate, I have studied the genre and it isn't a pretty sight.
Translation: I have spent too much time in McDonalds and shopping centres.

In my day
Translation: stupid old buzzard

I didn't know what a baseball cap was until I turned 30

Translation: The man obviously crawled out from under a rock

I still don't really know what a home eee is

Translation: Is it better that I don't know ?

But the fundamentals of electricity don't change thank goodness. A short circuit still can't be lenghtened, despite what we used to tell the apprentices.
Just wire to the "one flash and you're ash" maxim, and you'll be right.

FollowupID: 633752

Follow Up By: Member - Kroozer (WA) - Thursday, May 21, 2009 at 20:32

Thursday, May 21, 2009 at 20:32

What a crack up, im actually laughing and learning at the same time. Wow, and i thought i was the teacher.

Good stuff Footy, i like the ''one flash and your ash'' comment. I think i'll adopt that to my memory bank for future reference. Couldnt be more true.

Cheers mate

FollowupID: 633762

Follow Up By: Member - Footloose - Thursday, May 21, 2009 at 20:44

Thursday, May 21, 2009 at 20:44

Kroozer, there is nothing as funny as an ex teacher :))
Unless of course it's an ex .....
Footy's photo

FollowupID: 633768

Follow Up By: Member - Kroozer (WA) - Thursday, May 21, 2009 at 21:50

Thursday, May 21, 2009 at 21:50

Crikey Footy, you really have blown me away on this one. I would never have guessed you were an ex teacher mate. I knew by titling the thread with the word Guru i would get some good advice, didnt think i would get a real guru though. Well done mate, your still teaching and im still learning. Excellent

FollowupID: 633779

Follow Up By: Member - Footloose - Thursday, May 21, 2009 at 21:53

Thursday, May 21, 2009 at 21:53

Kroozer, shhh! That's in a past life now. :))))

FollowupID: 633780

Reply By: Wayne (NSW) - Thursday, May 21, 2009 at 19:07

Thursday, May 21, 2009 at 19:07

Kroozer,

If you blow a fuse, No it will not run the fridge and oven together.

If the wire to the spotlights starts to get hot and burn and the vehicle catches fire may be a fuse should have been fitted.

That is the trouble when I have a beer before answering.

I think that Footy has the right answer.

Wayne

AnswerID: 365997

Follow Up By: Member - Kroozer (WA) - Thursday, May 21, 2009 at 19:35

Thursday, May 21, 2009 at 19:35

Ha Ha coming to class half cut are we?

I still dont get why i would need the in line fuse though, as the relay fuse will be as close to the battery as a normal fuse and if the lights draw excessive current the relay fuse should blow. Or do they work another way in which im not aware of?

FollowupID: 633745

Reply By: funnyfarm - Thursday, May 21, 2009 at 19:13

Thursday, May 21, 2009 at 19:13

Sorry sir for the late homework, the dog ate it and i had to do it again.

Answer 1 - Fuse should be OK.

Answer 2 - We just dug out our DS portable oven and hubby put a multimeter on it and it rougly draws at least 6 1/2 amps. Would definately not recommend running it with any other appliance at the same time as if you run it with say your fridge, you will be definately drawing over 10 amps and run the risk of blowing fuses and melting wires.

Time for a beer (or for hubby anyway as i don't drink the stuff and he did answer all these questions as i wouldn't have a clue.)

Cheers
Funnyfarm

AnswerID: 365999