How can I calculate the thin film resistor's power dissipati

Hi!How can I calculate the thin film resistor's power dissipation.For example, for a FET bias using, 0.5V voltage will drop on the resistor and near 100mA current cross it .
Best regards!
-cqcq

This is a simple as Ohm's Law!

The power disipated in a resistor is basically the voltage across the resistor multipled by the current through it.

P = IV = 0.5V * 0.1A(100mA) = 0.05Watts (or 50mW)

Thanks!

May be I'm not express my problem exactly. How can I makesure what size of the resistor can sufferable 50mW power dissipation.

Yep, I think you win the dumbest post of the year award!

When you bought the resistor, what did the shipping package list as its power rating?

en...the thin-film resistor is which I drawing on a Al2O3 sub.usually 50ohm/square ,but I cannt know a "square" resistor can sufferable how much power.

I use the following table as a rule of thumb:

Sorry, thought you meant you had bought a resistor and could not figure out the rating. My bad!