Question

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

Answer 1

Answer:

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