Did you know?
Sound travels ~4Ć faster in water than in air ā about 1,480 m/s vs 343 m/s.
Did you know?
Sound travels ~4Ć faster in water than in air ā about 1,480 m/s vs 343 m/s.
A step-down transformer connected to an AC mains supply of V is made to operate at V, W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
To solve this problem, we need to use the concept of a transformer and the power relation in an electrical circuit.Given:⢠The primary voltage V⢠The secondary voltage V⢠The power of the lamp WSince the transformer is ideal (ignoring power losses), the power in the primary circuit is equal to the power in the secondary circuit WThe power in the secondary circuit is given by where is the current in the secondary circuit.Rearranging for AThe transformer equation relates the primary and secondary currents and voltages:Rearranging for Substitute the known values: ATherefore, the current in the primary circuit is A. This corresponds to Option 1.
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