Question

What is the resistance of a 4-W resistor and a 12-W resistor connected in parallel?

Answer 1

I'm assuming the units of resistor are Ohm() and not W

Now when resistors are connected in parallel, then

1/Req = 1/R1 + 1/R2

Req = R1*R2/(R1 + R2)

Given that R1 = 4 & R2 = 12

So,

Req = equivalent resistance = 4*12/(4 + 12)

Req = 3

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Check the unit and let me know if it doesn't work.