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I know that E = IxR or in my case R = E divided by I

Now my problem. -- I found some heated panel on ebay and bought several and made a heated jacket. The Jacket worked quit well, except when leaning back against the back rest you feel that heat on your back more than the fron. What I need to do is install a resistor in the back panel to lower the heat some, but not all. Maybe by 25%.

The panel(s) is pulling 2.5 amps (actually 1.25, but have 2 panels). Voltage is 12V. Using OHM's Law, what size resistor should I install? If I take

12v(E) and divide it by the 2.5 amps (I), I get 4.8 ohms (R). But is that 4.8 ohms --- 480 ohms, 4800 ohms etc?

Since I want to only reduce the heat (engery) do I install a different resistence?

In other words, what do I need to do?

I'm using a Gerbing temp control, but still need to change the heat ratio front to rear.

Thanks,