Physics Alternating Current Alternating Current Overview Class 12th Physics

Match List – I with List – II.

(A) AC generator                 (I) Detects the presence of current in the circuit

(B) Galvanometer               (II) Converts mechanical energy into electrical energy

(C) Transformer                  (III) Works on the principle of resonance in AC circuit

(D) Metal detector             (IV) Changes an alternating voltage for smaller or greater value

Choose the correct answer from the options given below:

Option 1 - <p>(A) – (II), (B) – (I), (C) – (IV), (D) – (III)</p>

Option 2 - <p>(A) – (II), (B) – (I), (C) – (III), (D) – (IV)</p>

Option 3 - <p>(A) – (III), (B) – (IV), (C) – (II), (D) – (I)</p>

Option 4 - <p>(A) – (III), (B) – (I), (C), (II), (D) – (IV)</p>

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Power factor of series LCR circuit at resonance is

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_{$\Rightarrow c o s ? = \frac{V_{R}}{\sqrt[]{V_{R}^{2} + {(V_{L} - V_{C})}^{2}}} = 1$}

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$E = \sqrt[]{{(60)}^{2} + {(100 - 20)}^{2}}$

E = 100V

Figure shows a circuit that contains four identical resistors with resistance R = $2.0 Ω,$ two identical inductors with inductance L = 2.0mH and an ideal battery with emf E = 9V. The current ‘i’ just after switch ‘S’ is closed will be:

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Just after the switch ‘S’ is closed, the inductor acts as open circuit.

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Physics Alternating Current 2025

Physics Alternating Current 2025

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