| mikey52 |
Sat Feb 12, 2005 7:01 pm |
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mm..trying to step voltage down to my 6 v wiper moter here....Radio Shack's 1 ohm resistor is rated at 10 watts. it's a big sucker maybe an inch or so long by 3/8" thick...with heavy leads.....it is my understanding thet the resistor should be rated for about 70 watts...where do I get a monster like that ??? I quote another scource:
WW MOTOR Some folks put a resistor (1 ohm or so) in series with the WW motor to drop the voltage to an acceptable level, but the resistor has to be able to dissipate a great amount of heat:
V=IR voltage = current times resistance
12 volts = I * 2 ohm
6 amps = I looks like 6 amps in this example
Pd = VI power dissipation = voltage times current
Pd = 12 * 6
Pd = 72 watts and it looks like the 1 ohm resistor should
be rated for 72 watts, anyhow
Mike |
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| Alan Willis |
Sat Feb 12, 2005 7:22 pm |
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| Why dont you spend the $35 and get a 12v armature? |
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| mikey52 |
Sat Feb 12, 2005 7:27 pm |
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Cus 1.60 plus tax beats that.......
Iam workin on the cheap for now...... |
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| mikey52 |
Sat Feb 12, 2005 8:52 pm |
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| The replacement coil for 12 volt is a Borg-Warner number E-81..smaller than the 6 volt...it is marked as an internal resistor coil however. It also has 407 stamped on it. Is this the right coil??? |
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