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# resistor confussion

#### choodan

Oct 18, 2023
1
hi ,
A smd ressitor of 0.1W power rating can be supplied with 5v,2A??

Feb 19, 2021
677
No.

P = V x I = I^2 x R or R = P / ( I^2 )

So you are asking a .1W R to dissipate V x I = 5 x 2 = 10W....., thats a no no

So R = .1 / 4 = .025 ohms, that the limit on a .1 W R if you drive 2 A thru it.

Regards, Dana.

#### kellys_eye

Jun 25, 2010
6,230
hi ,
A smd ressitor of 0.1W power rating can be supplied with 5v,2A??
What else constitutes the circuit? Is this a resistor on its own (i.e. the 5V 2A supply connected across it) or is the applied voltage/current passing through it to 'something else?

You can apply 1,000,000V and 1,000,000 amps to a 0.1W resistor provided there's nothing connected to the other end of it...... except, if there's no connection to the other end of that resistor then no current will flow in it.

More details needed please.

#### AnalogKid

Jun 10, 2015
2,843
hi ,
A smd ressitor of 0.1W power rating can be supplied with 5v,2A??
No. 0.02 A

Watt's Law: P = E x I >> Power equals voltage times current.

ak

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