The primary windings of a transformer which has an 88% efficiency are connected to 110-V ac. The secondary windings are connected across a 2.4-Ω, 75-W lightbulb. (a) Calculate the current through the primary windings of the transformer. (b) Calculate the ratio of the number of primary windings of the transformer to the number of secondary windings of the transformer.

Step-by-step solution

Step 1 of 5 </p>

The voltage of the primary coil

The resistance of the light bulb connected to secondary coil

The power of the light bulb connected to the secondary coil.

The power of the primary coil.

Step 2 of 5</p>

a)

The efficiency of the transformer is 88%. The power transferred to the secondary coil of the transformer is 88% percent of the primary.

Step 3 of 5</p>

a)

The number of turns of primary coil

The number of turns of secondary coil.

The voltage across the primary coil

The voltage across the secondary coil.