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Author [ES] [MY] [PL] [PT] [IT] [DE] [FR] [NL] [DK] [NO] [GR] [TR] Topic: So who is the electrics guru?  (Read 1177 times)

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Online Paul2bikes

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Re: So who is the electrics guru?
« Reply #10 on: 07 November, 2018, 11:07:36 AM »
So as said previously, a duff bulb or poor connection?
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Offline ZuluTiger

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Re: So who is the electrics guru?
« Reply #11 on: 07 November, 2018, 11:30:58 AM »
We need to hear from him about what the resistance reading is on the two bulbs. Also, they both need to be tested from the same battery (at the same voltage) or voltage source, and both need to have the same temperature. If he tests one after 10 minutes of duty, and the other cold, they'll differ. But, sure, there may be a duff bulb and that should be clear after the correct test.

Offline ZuluTiger

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Re: So who is the electrics guru?
« Reply #12 on: 07 November, 2018, 11:34:59 AM »
Here is another way to do this. Connect the two bulbs in series with the ammeter and any voltage source. Allow them to settle and heat up. This way, the current is equal through the bulbs. After a time, measure the VOLTAGE across the bulbs and then consider how different they are or do the resistance calculation to figure out if one is failing or duff or just not of equivalent spec. In this test, matching bulbs will have a 6V measurement each from a 12V source according to the voltage divider rule...
« Last Edit: 07 November, 2018, 11:36:55 AM by ZuluTiger »

Offline TimboLeMatelot

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Re: So who is the electrics guru?
« Reply #13 on: 07 November, 2018, 02:16:18 PM »
Is it a hi/lo beam lamp. If so what connection is it on?

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Re: So who is the electrics guru?
« Reply #14 on: 07 November, 2018, 02:25:29 PM »
*Originally Posted by TimboLeMatelot [+]
Is it a hi/lo beam lamp. If so what connection is it on?

H7 is single filament.
The greatest deception men suffer is from their own opinions.
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Re: So who is the electrics guru?
« Reply #15 on: 07 November, 2018, 04:47:15 PM »
Think I have answered my own question, the brighter bulb is pulling more power,  the bulb pulling 3 amps is effectively only 36 watts, crap bulb
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Offline ZuluTiger

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Re: So who is the electrics guru?
« Reply #16 on: 07 November, 2018, 09:53:08 PM »
Tim, was the applied voltage 12V? Was it stamped as being a 55W? Was it new or an old bulb? If it did not run at 55W with 12V applied, you should expect a refund / exchange. Did you notice any change as it heated up? Current falling slightly? This scenario is like tequila: Hard to stop once you get started... 

I guess what I'm trying to say is that no measurement can be done with one meter. (Paullie can wax officious as much as he likes, but truth is truth, my biker brother. A dashboard (or applied) voltmeter is like having every second page of a book being blank.) To accurately understand the issue, you have to quote the measured voltage AS WELL as the current that is drawn by the voltage being applied to a (slightly) variable load. You cannot simply multiply your current by 12V to get the wattage. It's the voltage you apply that counts. Quo Vadis?
« Last Edit: 07 November, 2018, 10:11:09 PM by ZuluTiger »

Offline Paullie

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Re: So who is the electrics guru?
« Reply #17 on: 07 November, 2018, 10:39:09 PM »
I think I'd just go out and buy a new bloody bulb, and not try to turn a molehill into a mountain ...

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Re: So who is the electrics guru?
« Reply #18 on: 08 November, 2018, 02:31:07 AM »
You plant bulbs, you light up lamps.

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Re: So who is the electrics guru?
« Reply #19 on: 08 November, 2018, 05:25:26 AM »
*Originally Posted by Paullie [+]
I think I'd just go out and buy a new bloody bulb, and not try to turn a molehill into a mountain ...

 :008: :008: :008:  Did you read my first post?  It was never about the bulb, I dont need a bulb,  it was actually about the battery and watts vs amps :010:
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