so a 0.25w and 2w resistor what is their own purpose?
2007-11-16 13:26:17 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Place a pair of 1-ohm resistors across a 1-volt source. Each will draw 1 amp and dissipate 1 watt. The resistor rated at 2 watts will do so faithfully for years. It will get warm, but its resistance will remain relatively stable. The quarter-watt resistor will get hot and deteriorate within a small number of hours.
In each case, the purpose of the resistor is to emulate a pure resistance in a circuit, when used within its design limits.
2007-11-16 17:46:59 · answer #1 · answered by Frank N 7 · 0⤊ 0⤋
the resister wattage means that how much current undergo through the resister
example if we take 2 wattage resister means
P = V.I
:> I = P/V
for 5 voltage there are max current is = 2/5
= 0.4 amp
2014-01-29 13:20:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It's a rating for how much power (P=IE) the resister can tolerate. I = current in amperes, E = voltage in volts.
2007-11-16 21:29:16 · answer #3 · answered by Anonymous · 1⤊ 0⤋
its the ammount of power they can dissipate without frying.
Power = current(squared) x resistance
or
Power = Current x Voltage
the power handling is limited by the numbers you wrote
2007-11-16 21:32:32 · answer #4 · answered by Andrew K 1 · 1⤊ 0⤋
power rating!.....remember a girls name?.............................. Ivy watts?........i=current(amps) x V =(volts) = power(watts)..for example 1000watt hair drier running on 250volts=4 amp fuse...or.. 1000watt hair drier running on 125volts=8 amp fuse...etc...
2007-11-16 21:48:57 · answer #5 · answered by djave djarvoo 'djas originel 5 · 1⤊ 1⤋