{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

TRANSFORMERS

# TRANSFORMERS - TX 1 TRANSFORMERS PRIMARY WINDING SECONDARY...

This preview shows pages 1–4. Sign up to view the full content.

TX 1 TRANSFORMERS IRON CORE TRANSFORMER In an ideal transformer : V V N N a 1 2 1 2 = = , I I a 2 1 = , V I V I 1 1 2 2 = One current reference has to be into a dotted terminal, and the other current reference has to be out of a dotted terminal. V 1 _ _ + + IRON CORE I 1 I 2 SECONDARY WINDING PRIMARY WINDING V 2 N 1 TURNS N 2 TURNS I 2 V 2 + _ I 1 V 1 + _

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
TX 2 Example 1 The ratio of a primary to secondary turns (a) of an iron-core transformer is five. A 120 resistor is connected across the secondary winding. Find the resistor voltage when the primary current is 0.5 A (rms). Ideally: I I N N I A A 2 1 1 2 1 5 5 0 5 2 5 = = = × = . . V I V rms R = = 2 120 300 ( ) ( ) , V V V rms R 1 5 1500 = = ( ) Practically: V I V I efficiency 2 2 1 1 = × ( ) , I 2 & V R might be lower. Example 2 A 120 V (rms) AC source is connected to the primary winding of the transformer in the previous example. Determine the primary current I 1 and the voltage across the 120 resistor. Assume ideal conditions. 120 I 2 _ + V R 5:1 I 1 V 1 + _ 120 I 2 _ + v R 5:1 I 1 120 V RMS + _
TX 3 V V V a V R = = = = 2 1 120 5 24 I V R A 2 2 24 120

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}