The resistance R1 is 40 ohm, R2 is 60 ohm, the two are in parallel, the voltage at both ends is 120 v. calculate (1) the total resistance; (2) the current of each resistance; (3) the total current

The resistance R1 is 40 ohm, R2 is 60 ohm, the two are in parallel, the voltage at both ends is 120 v. calculate (1) the total resistance; (2) the current of each resistance; (3) the total current


(1) R = r1r2 / (R1 + R2) = 40 * 60 / (40 + 60) = 24 ohm
(2)I1=U/R1=120/40=3A
I2=U/R2=120/60=2A
(3) I total = I1 + I2 = 3 + 2 = 5A



Buoyancy formula?


F = row G
F = density of water * GV
F floating = f upward pressure - f downward pressure
When an object floats or floats, f = G
When the object sinks to the bottom, f floats = g object-n



What is the balance method of buoyancy calculation?