A 2.2 kΩ resistor is rated at ‘½ W’. What is the highest voltage you could safely apply to the resistor help!

Question

A 2.2 kΩ resistor is rated at ‘½ W’. What is the highest voltage you could safely apply to the resistor without risking damage to it from overheating?

help please

Answer: 33 V

Answer 1

P = EI = E^2/R   (Power formula + Ohm's law)

E = sqrt(PR) = sqrt (1/2 * 2200) = 33.17 v.

(33 v. is close enough given the tolerance of resisters etc.)

Answer 2

P=I*E

E=IR

I=E/R

P=E^2/R

E^2=PR

You are correct.