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Does a stronger resistor dissipate more power?
This also makes sense in the context of the power law, because P=IV and I=V/R, so P=V2/R. So P∝1/R and a smaller resistor dissipates more heat.
What happens if you use too large of a resistor?
For a simple LED circuit there are no bad consequences of using a resistor of higher power. On the other hand, some type of high speed communication system may not like the increased capacitance to ground of a large resistor or, the increased series inductance.
What happens to wattage in parallel?
When the bulbs are connected in parallel, each bulb has 120 V across it, each draws 1/3 A, and each dissipates 40 watts. Since all three bulbs are 40-watt bulbs, they have the same resistance, so the voltage drop across each one is the same and equals one-third of the applied voltage, or 120/3 = 40 volts.
Can you put multiple resistors in a circuit?
For instance a 30k resistor is not an E12 series value, but you can obtain it by putting two 15k resistors in series to allow a higher voltage. 0603 resistors have a working voltage of 50V, So if you want to use them in a 70V circuit you’ll have to place at least two of them in series.
Why do current sources have a higher resistance?
Current sources are the other way around. They’re designed for high internal resistance so you get a hotter load for a higher load resistance. But in general, you get more power in the load if it’s matched to the source. It depends on if your power supply is constant voltage or constant current.
When do you draw the most power from a resistor?
$\\begingroup$ You will draw the most power (and hence dissipate the most heat) when the resistor value matches the internal resistance of the source, as DanielSank states. This is a truth that any sound engineer knows, because it determines how loudspeakers should be matched to amplifiers.
Why do you need a high resistance resistor?
He argued that you wanted the resistor to have a high resistance because P = I 2 R, so P ∝ R. But I thought back to messing around with resistors and batteries, where I remember that if I attached a much lower resistance to a battery, it would begin to heat up much faster than a bigger resistor.