Apologies for my low understanding level, but I had been building circuits with 1k ohm resistors rated at 1/4W. I just noticed that the supplier is now giving 1/6W. any reason for me to be concerned?
I am using these to connect to 2N-3904 transistors, and then again to operate some control pins on a custom device. I have 5v and 3.3v all over the place, not sure what current tho?
Well, worst case you have a resistor from 5V to Gnd,
so current I = V/R = 5V/1000 = 5mA.
Power dissipation in a device = current x voltage, P = IV
0.005A x 5V = 25mW
1/6W = 167mW
Think you'll be okay.
Probably because they have multiple suppliers and quote only the most restrictive spec.
The maximum current at 5V is 5mA, maximum power 26mW. With 1/6W you can go upto
13V for 1k resistors.
V = I R
P = V I = V^2 / R = I^2 R
Oh ok. These equations are starting to make a little sense now.
Thanks guys!