Question

1. a branch of a parallel circuit that has an open component

a allows no current
b allows current to reach maximum
c measures 0 volts across the open component
d measures the applied voltage across the good component

Explanation:

In a parallel circuit, if a branch has an open component (a break in the circuit path), according to Ohm's law \(I = \frac{V}{R}\), when there is an open (infinite resistance in that branch), the current \(I\) in that branch is \(I=\frac{V}{\infty}=0\) (since voltage \(V\) is finite across parallel branches). For option c, in a parallel circuit, the voltage across each branch is equal to the applied voltage (not 0). For option b, an open branch does not allow maximum current (maximum current would be when resistance is minimum, but here resistance is infinite). For option d, the question is about the open - component branch, not the good - component branch.

Answer:

A. allows no current