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Physics Exercises/Circuits

< Physics Exercises
  1. How does the change in resistance of an incandescent lamp and the thermal inertia of the filament affect its reactance?
  2. A simple lead-acid battery charger consists of a variable transformer, rectifier, moving coil ammeter and a fuse. Why the fuse blows well before the current, according to the ammeter, reaches the rated value of the fuse.