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In an electrical circuit power (heat) is equal to current times resistance. P = I * R. A fellow named Ohm figured that out awhile back so we call it Ohm's law.
If a 1 kΩ and 2 kΩ resistance i parallel with a 1.5V battery, which resistance have a higher temperature? Is it IxIxR ? Which is true, higher current, higher temperature or higher resistance, higher temperature?
The filament of a bulb is extremely long. Which bulb will be brighter, a long or short filament. Remember resistance changes with temperature.