Question

equivalent resistance of 6 ohm and 12 ohm connected in parallel

Answer 1

Answer:

1/6+1/12

Explanation:

2+1/12=3/12=1/4then r=4

Answer 2

Answer:

just using ohm's law, v=1*r

we can solve for the current through each resistor add the currents and calculate the combined resistance.

the voltage is the same v across all three resistors, 69 and 18 ohms

the current through each one is 1=v/r, total current I total=v/6+v/9+v/18

the combined resistance is

r=v/i

r=v/(v/6+v/9+v/18)

r=v/(3v/18+2v/18+v/18)

r=v/(6v/18)

r=v*18/6v

r=18/6

r=30ohms