Question

1. a changed value component in an rl series circuit

a measures 0 volts across it
b causes current to stop
c measures the applied voltage across it
d increases or decreases the opposition to current

Explanation:

In an RL series circuit, resistance \(R\) and inductive reactance \(X_L\) (related to inductor) contribute to impedance \(Z=\sqrt{R^{2}+X_{L}^{2}}\). A change in \(R\) or \(L\) (affecting \(X_L = 2\pi fL\)) changes \(Z\). Impedance is the opposition to current (\(I=\frac{V}{Z}\), \(V\) - applied voltage). So a changed component value changes opposition to current.

• Option A: Only if component is short - circuited (not general case of value change).
• Option B: Current doesn't stop unless circuit is open - not due to component value change.
• Option C: Only if component is open - circuited (not general value change).

Answer:

D. increases or decreases the opposition to current