Two technicians are explaining basic electricity and electronics: technician a says that when one resistor is open in a parallel circuit, all the current flow in the circuit is stopped. technician b says that when resistance in a circuit stays constant, if the voltage is decreased, the current decreases. which technician is correct? a. neither technician a nor technician b b. technician a only c. both technician a and technician b d. technician b only

The answer is D. Technician B only

Explanation:

First we need to assume they are talking about simple circuits, with the source and a resistor,  at zero frequency .If the resistor is left open at a parallel circuit, current will  still flow through the other components.

Technician A is incorrect.

Technician B applies Ohm's law,

V = I*R,

V is the voltage

I is the current

R is the resistance

If R remains constant, If the voltage decreases, the current will decrease too

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j