(5.1)

A single phase transformer has a primary turns.

Transformer has a secondary turns.

Secondary voltage is V.

(5.1.1)

Find the primary voltage.

Relation between number of turns and voltage is .

Substitute , and .

The primary voltage 400 V.

(5.1.2)

A single phase transformer has a primary turns.

Transformer has a secondary turns.

Secondary current is A.

Find the primary current.

Relation between number of turns and voltage is .

Substitute , and .

The primary current 10 A.

(5.1.3)

The primary current 10 A.         [From 5.1.2]

The primary voltage 400 V.       [From 5.1.1]

Power factor of primary current is .

Primary power of the transformer is  .

The primary power 2400 W.