You are given a number of 10 Ω resistors, each capable of dissipating only 3.0 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in parallel to make a 10 Ω resistance that is capable of dissipating at least 8.6 W?

My answer is 1 which is wrong idk why pls help. Tried searching it.. I got wrong

Question

You are given a number of 10 Ω resistors, each capable of dissipating only 3.0 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in parallel to make a 10 Ω resistance that is capable of dissipating at least 8.6 W? 

My answer is 1 which is wrong idk why pls help. Tried searching it.. I got wrong

mrnood · Answer

I am 'currently' answering this in the MATHS section

@potatobibin - probably best if you only post your question in 1 place at a time