A series combination of L and R is connected to a battery of emf E and negligible internal resistance, then the final value of AC current depends upon:
Correct answer: D. L, R, and E
- A. L and R
- B. E and L
- C. E and R
- D. L, R, and E
Explanation
In a series R-L circuit connected to a DC battery, the final value of the current is determined by the battery's emf (E), the resistance (R), and the inductance (L). When the circuit reaches a steady state, the inductor behaves like a short circuit, and the current is determined by Ohm's law, I = E/R. However, during transient states, the inductor affects the time it takes to reach this steady state. Therefore, all three components-L, R, and E-play a role in determining the final current. Option A is incorrect because it ignores the battery's emf, Option B neglects the resistor, and Option C disregards the inductor's effect.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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