Re: Electronics 101 Question .....

Posted by 55 50 on October 25, 2006 at 17:31:13 from (216.114.212.192):

In Reply to: Electronics 101 Question ..... posted by MMB on October 25, 2006 at 15:35:07:

I agree 100% with Gerald. Heat is power and power is equal to current squared times resistance. Current is voltage divided by resistance.

For the two cases mentioned:
(first)
Current is 6 volts divided by 3 ohms or 2 amps
Power is 2 amps squared times 3 ohms or 12 watts
(second)
Current is 6 volts divided by 10 ohms or .6 amps
Power is .6 amps squared times 10 ohms or 3.6 watts.

How hot the resistors will get depends on what their power ratings are as Gerald mentioned and you didn"t specify any wattage ratings for the resistors.

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