Question

A 100% efficient transformer has 100 turns in the primary and 50 turns in its secondary coil. If the current in the secondary coil is 6 A, then the current in the primary coil is ______.

Options

• 1 A

• 3 A

• 8 A

• 16 A

Answer 1

A 100% efficient transformer has 100 turns in the primary and 50 turns in its secondary coil. If the current in the secondary coil is 6 A, then the current in the primary coil is 3 A.

Explanation:

For 100% efficient transformer, `"V"_"s""I"_"s" = "V"_"P""I"_"P"`

`therefore "V"_"s"/"V"_"P" = "I"_"P"/"I"_"s" = "N"_"s"/"N"_"P"`

`therefore "I"_"P"/6 = 50/100`

`therefore "I"_"P" = 3`A