JAMB - Physics (2023 - No. 47)
From the diagram above, if the potential differences across the resistor, capacitor, and inductor are 30V, 120V, and 60V, respectively, the effective potential difference is
81
67
59
73
解释
\(V_L\)=60 V ,\(V_C\) = 120 V , \(V_R\) =30V
;V = ?
; \(V^2\) = \(V_R^2\) + \(V_L\) - \(V_C^2\)
= \(V^2\) = \(30^2\) + \(60 - 120^2\)
= \(V^2\) = 900 + 3600
= \(V^2\) = 4500
= V = √4500 = 67V