(b)A laptop needs voltage supply of 6.0 V connected to a 240 V supply by an adaptor. Ifthe transformer inside the adaptor has 20 turns of secondary coil, calculate the numberof turns of primary coil.A step-down transformer with efficiency 60% use to convert 240 V to 30 V. If thecurrent on primary coil is 1.2 A, calculate the current on secondary coil.(c)

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Answered: A laptop needs voltage supply of 6.0 V…

A laptop needs voltage supply of 6.0 V connected to a 240 V supply by an adaptor. If the transformer inside the adaptor has 20 turns of secondary coil, calculate the number of turns of primary coil.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

(b)
A laptop needs voltage supply of 6.0 V connected to a 240 V supply by an adaptor. If
the transformer inside the adaptor has 20 turns of secondary coil, calculate the number
of turns of primary coil.
A step-down transformer with efficiency 60% use to convert 240 V to 30 V. If the
current on primary coil is 1.2 A, calculate the current on secondary coil.
(c)

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