(I) Neon signs require 12 kV for their operation. To operate...

Name: Problem 30, Chapter 21: Physics: Principles with Applications
Uploaded: 2019-05-22T01:31:57-08:00
Duration: 1 min 59 s
Channel: Ceren Uzun
Description: (I) Neon signs require 12 kV for their operation. To operate from a 240-V line, what must be the ratio of secondary to primary turns of the transformer? What would the voltage output be if the transformer were connected in reverse?

(I) Neon signs require 12 kV for their operation. To operate from a 240-V line, what must be the ratio of secondary to primary turns of the transformer? What would the voltage output be if the transformer were connected in reverse?

Key Concepts

Transformer Operation

Transformers operate on the principle of electromagnetic induction, where an alternating current in the primary winding produces a varying magnetic field that induces a voltage in the secondary winding. This basic mechanism allows energy to be transferred between two circuits, typically with a change in voltage and current levels while ideally conserving power, aside from losses.

Turns Ratio

The turns ratio of a transformer, defined as the ratio of the number of turns in the secondary winding to the number of turns in the primary winding, directly determines the voltage transformation between the two sides. In an ideal transformer, the voltage ratio equals the turns ratio, meaning that stepping up or stepping down voltage is achieved by having proportionally more or fewer turns in the secondary winding relative to the primary winding.

Reverse Operation of Transformers

A transformer can be operated in reverse by interchanging the roles of the primary and secondary windings. In this configuration, the original secondary becomes the input and the original primary becomes the output. The voltage transformation then follows the inverse of the originally designed turns ratio, meaning that the same ratio used to step down the voltage in one direction will step up the voltage by the reciprocal value when the transformer is connected in reverse.

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