اسئله في المقاومه

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[CENT
ER]السلام عليكم ورحمه الله وبركاته [/CENTER]

لو سمحتوا ساعدوني في حل هذه الاسئله:


The wire has a resistance of 100 ohms. What is the resistance of another wire if its resistivity is thrice as much as the first wire, the length of the second wire is half of the first wire and the diameter is reduced to 50% of the first wire?



وسؤال الثاني :
Three resistors in parallel have values of R1 = 68 kΩ, R2 = 56 kΩ and R3 = 82 kΩ. Calculate :
a. The total resistance and determine the current each resistor would take from a 14 V supply.
b. The resistance of a fourth resistor which should be connected in parallel with the three resistors if the supply current is increased to 1 mA.