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The observable universe is ~93 billion light-years across — and it's still expanding.
Did you know?
The observable universe is ~93 billion light-years across — and it's still expanding.
A 12 V, 60 W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220 V. Assuming the transformer to be ideal, what is the current in the primary winding?
To solve this problem, we need to use the concept of an ideal transformer.Given:• Voltage across the primary V• Voltage across the secondary V• Power of the lamp WFor an ideal transformer, the power in the primary equals the power in the secondary:Since the lamp is connected to the secondary, the power in the secondary is:Substitute the known values:Solve for ANow, using the transformer equation for an ideal transformer:Substitute the known values:Rearrange to solve for ATherefore, the current in the primary winding is approximately AThis corresponds to Option 1.
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