marv
:Hi all ...I recently picked up some 25,000 ohm @ 50 watt porcelin resistors. They have a moveable adjuster on them. I usually use these in my early A.C. sets. The problem is I usually need more than one adjustor. I tried to make more with a strip of meatal and a small nut/bolt to tighten ..but does not work all that great...ANY SUGGESTIONS?
:
Nice idea. Just because a 25,000 ohm resistor is rated 50 watts doesn't mean a small portion can carry more current. Each portion of the resistor is limited in current as to what the overall resistor can carry.
Norm
:Shine the wires in the area of contact w/fine sand paper.
:
:marv
:
::Hi all ...I recently picked up some 25,000 ohm @ 50 watt porcelin resistors. They have a moveable adjuster on them. I usually use these in my early A.C. sets. The problem is I usually need more than one adjustor. I tried to make more with a strip of meatal and a small nut/bolt to tighten ..but does not work all that great...ANY SUGGESTIONS?
::
:
:Hi
:
: Nice idea. Just because a 25,000 ohm resistor is rated 50 watts doesn't mean a small portion can carry more current. Each portion of the resistor is limited in current as to what the overall resistor can carry.
:
: Norm
:
::Shine the wires in the area of contact w/fine sand paper.
::
::marv
::
:::Hi all ...I recently picked up some 25,000 ohm @ 50 watt porcelin resistors. They have a moveable adjuster on them. I usually use these in my early A.C. sets. The problem is I usually need more than one adjustor. I tried to make more with a strip of meatal and a small nut/bolt to tighten ..but does not work all that great...ANY SUGGESTIONS?
:::
::
:
What you are doing is fine just current is a small section can't be higher than resistor overall rating.
To keep numbers round I will use 40 ma max for your resistor. 25000 x .04 = 1000 volts. 1000 x .04 = 40 watts Use one section of 5000 ohms current is still limited to 40 ma. 5000 x .04 = 200 volts 200 x .04 = 8 watts. A 5000 ohm section off a resistor like this would be limited to 8 watts.
You can get a little more due to heat sinking but resistor wire size will limit each section.
Norm
:Soooo Norm...are you saying that what I am doing is not a good idea or is ok?... What I am doing is using these resistors for "block" sections...say 2000 ohms and 5000 ohms....Or I need a resistor at 5000 ohms at 15 watts. What I did is I took my Dremmel tool cut resistor in half...and made a adjuster so between the two lugs I have 5000 ohms.
:
:
:
::Hi
::
:: Nice idea. Just because a 25,000 ohm resistor is rated 50 watts doesn't mean a small portion can carry more current. Each portion of the resistor is limited in current as to what the overall resistor can carry.
::
:: Norm
::
:::Shine the wires in the area of contact w/fine sand paper.
:::
:::marv
:::
::::Hi all ...I recently picked up some 25,000 ohm @ 50 watt porcelin resistors. They have a moveable adjuster on them. I usually use these in my early A.C. sets. The problem is I usually need more than one adjustor. I tried to make more with a strip of meatal and a small nut/bolt to tighten ..but does not work all that great...ANY SUGGESTIONS?
::::
:::
::
:
Nothing wrong with using sections as long as current isn't exceeded. Can't go by watttage alone. As you go lower in resistance wattage will also be reduced. A section of resistor measuring 500 ohms can only dissipate .8 watts using 40 ma for the resistor.
500 ohms x .04 amps = 20 volts
20 volts x .04 amps = .8 watts
You have a good idea especially when a specific resistor value isn't available.
Norm
::George
::
:: What you are doing is fine just current is a small section can't be higher than resistor overall rating.
::
:: To keep numbers round I will use 40 ma max for your resistor. 25000 x .04 = 1000 volts. 1000 x .04 = 40 watts Use one section of 5000 ohms current is still limited to 40 ma. 5000 x .04 = 200 volts 200 x .04 = 8 watts. A 5000 ohm section off a resistor like this would be limited to 8 watts.
::
:: You can get a little more due to heat sinking but resistor wire size will limit each section.
::
:: Norm
::
:::Soooo Norm...are you saying that what I am doing is not a good idea or is ok?... What I am doing is using these resistors for "block" sections...say 2000 ohms and 5000 ohms....Or I need a resistor at 5000 ohms at 15 watts. What I did is I took my Dremmel tool cut resistor in half...and made a adjuster so between the two lugs I have 5000 ohms.
:::
:::
:::
::::Hi
::::
:::: Nice idea. Just because a 25,000 ohm resistor is rated 50 watts doesn't mean a small portion can carry more current. Each portion of the resistor is limited in current as to what the overall resistor can carry.
::::
:::: Norm
::::
:::::Shine the wires in the area of contact w/fine sand paper.
:::::
:::::marv
:::::
::::::Hi all ...I recently picked up some 25,000 ohm @ 50 watt porcelin resistors. They have a moveable adjuster on them. I usually use these in my early A.C. sets. The problem is I usually need more than one adjustor. I tried to make more with a strip of meatal and a small nut/bolt to tighten ..but does not work all that great...ANY SUGGESTIONS?
::::::
:::::
::::
:::
::
: