This one confuses me. You have three resistors, 2 4r and one 6r, each with a power limit of 1 Watt. If they are all put in parallel so that they form a composite resistor, what is the max wattage that the composite resistor can handle before it burns up?
I thought 3W but am clearly wrong. I also got this explanation, which did not help me.
"Because 3W on the three resistors in // means 2.12V across each resistor (U=P⋅R−−−−√) and then U^2/R=(2.12V)^2/4ohm=1.124W for the 4ohm resistors. It is higher than 1W and can not be correct. Don't forget than we do not have three equals resistors."
Many thanks for your kind responses!
I thought 3W but am clearly wrong. I also got this explanation, which did not help me.
"Because 3W on the three resistors in // means 2.12V across each resistor (U=P⋅R−−−−√) and then U^2/R=(2.12V)^2/4ohm=1.124W for the 4ohm resistors. It is higher than 1W and can not be correct. Don't forget than we do not have three equals resistors."
Many thanks for your kind responses!