Question

The 1500 Ω resistor on electronic circuit board has correct power rating of 0.25 W.State disadvantage of using different 1500 Ω resistor with power rating that is (1)much less than 0.25 W? (2)much greater than 0.25 W?

http://maxpapers.com/wp-content/uploads/2012/11/5054_s11_ms_21.pdf

this question has 2 parts Each have it own answer so please describe them one at a time

Answer 1

1) smoke 2) size and cost

Explanation:

1) The power rating is to indicate the rate that the resistor can radiate away the heat generated. A `1/4 "Watt"` resistor can radiate away 0.25 J of heat every second. A resistor whose power rating is less than `1/4 "Watt"`, but is used in a circuit where the `P = I^2*R` calculation says it needs to try, will get too hot, smoke, and turn black. As a result the resistor's resistance may change.

2) A resistor whose power rating is much greater than `1/4 "Watt"` will be much larger in physical size. When you're trying to make a circuit board small, that is not a good thing. Higher power resistors are also more expensive.

I hope this helps,
Steve