Domanda del libro di testo
An ammeter has a sensitivity of 35, 000Ω /V. What current in the galvanometer produces full-scale deflection?
71
views
27. Resistors & DC Circuits
Intro to Current
Scelta multipla
If the voltage across a circuit remains constant (), how does the current () change when the resistance () is doubled?
A
The current doubles.
B
The current remains the same.
C
The current is halved ().
D
The current becomes zero.
Guida verificata passo dopo passo1
Recall Ohm's Law, which relates voltage (V), current (I), and resistance (R) as: \(V = I \times R\).
Since the voltage V is constant, we can express the current as: \(I = \frac{V}{R}\).
If the resistance R is doubled, then the new resistance becomes \$2R$.
Substitute the new resistance into the current formula: \(I_{new} = \frac{V}{2R}\).
Compare the new current \(I_{new}\) to the original current \(I\): \(I_{new} = \frac{1}{2} I\), which means the current is halved.
Video correlati
Pratica correlata
