Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q102 (CDS-I/2014) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

A mobile phone charger is

Result
Your answer: —  Â·  Correct: C
Explanation

A mobile phone charger functions as a step-down transformer. It is designed to convert the high-voltage AC mains (typically 100-240V) into a much lower, stable DC voltage (usually 5V) suitable for charging a mobile phone battery. Internally, these chargers are composed of a power transformer and a rectifier circuit. While modern chargers utilize Switch Mode Power Supply (SMPS) technology for efficiency, the fundamental electrical process involves stepping down the voltage from the high-input mains to a low-output level. This process ensures that the delicate electronic components and the lithium-ion battery of the phone are not damaged by high voltage. Unlike an inverter, which converts DC to AC, or a UPS, which provides backup power, the charger specifically reduces voltage to facilitate safe energy transfer.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
76%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2012 · Q69 Relevance score: 0.74

In step-down transformer, the AC output gives the

NDA-II · 2017 · Q63 Relevance score: -0.16

Step-up transformers are used for

NDA-I · 2009 · Q57 Relevance score: -0.60

The electric charge is stored in d device called

IAS · 1996 · Q120 Relevance score: -3.17

Assertion (A) : Transformer is useful for stepping up or stepping down voltages. Reason (R) : Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct ?

CDS-II · 2012 · Q46 Relevance score: -3.35

A device which is used in our TV set, Computer, Radio set for storing the electric charge is