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resistor parallel

sir

I need

100ohm 3 watt resistor

but cannot find it in market, in market I find 100ohm 1watt resistor

,plz tell me how I acquire (100ohm 3 watt resistor) value.

can I parallel three 100ohm 1 watt resistor to get my value

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You could use 3, 300 Ohm resistors 1W in parallel. Or 3 , 33Ohm resistors in series.

You CANNOT put 100 Ohm in parallel.

+1. I wouldn't say "can't", but in terms of paralleling 3 100 ohm resistors and expecting to get a 100 ohm combined load, nah that definitely won't work.

...in my defence, I was replying to the OPs comment

can I parallel three 100ohm 1 watt resistor to get my value

Simply, no, you cannot.

sorry, no offense, I was simply commenting. You are absolutely correct.

+1

-max-2 years ago

Skip to 6:27 to see how to figure out what resistors you need to wire in parallel and/or in series.

iceng2 years ago

If you only have a bunch of 100 ohm 1/2 watt resistors then you can easily make a 100 ohm 4.5 watt Resistor out of nine of them, which is better then a 3W

300ohm.GIF
-max- iceng2 years ago

Just keep them spread apart some to allow airflow over them! If they bundle up and snuggle together too close, they may get a little too warm!

seandogue iceng2 years ago

+1-ish....

unless that 3W load is also acting as a failsafe.... But you're right in principle

btw did you get an orange board query on this as well?

iceng seandogue2 years ago

Just only yours.

verence2 years ago

I agree with steveastrouk, but ... "CANNOT" is a hard word...

It needs a lot of resistors (i.e. 9) 100 Ohm resistors, but is IS doable.

Put
three of 100 Ohm resistors in parallel. That' give you the equivalent
of one 3W, 33.3Ohm resistor. Then put three of those paralleled groups
in series. Ta-dah! The equivalent of one 100Ohm, 3W resistor.

Or you could put three strands of three 100 Ohm resistors in series in parallel.

For higher power needs, just think bigger like 4x4 for 4W or 10x10 resistors for 10W.

Of course that all only makes sense if you already have the resistors or can get them much cheaper than the nominal ones.

...in my defence, I was replying to the OPs comment
can I parallel three 100ohm 1 watt resistor to get my value

Simply, no you cannot.