Electronics - Voltage and Current - Discussion


A secondary cell generates dc via chemical activity; a primary cell generates dc:

[A]. electrically
[B]. thermally
[C]. optically
[D]. chemically

Answer: Option D


No answer description available for this question.

Zahra said: (Jul 14, 2011)  
Can someone explain please.

Anand said: (Jul 20, 2011)  
Primary batteries can be used once because the chemical reactions that supply electrical current are Irreversible. In secondary batteries that the chemical reaction that supply electrical current are readily reversed. So in both batteries chemical reaction only takes place to generate dc.

Maya said: (Dec 31, 2012)  
What is dc?

Ali Umar said: (Mar 24, 2013)  
DC: Direct current which is supplied from batteries not from transformer. The graph of DC is totally straight but in AC(Alternating current) is sinusoidal which is supplied from transformer.

Anusha said: (Jun 29, 2013)  
What is the chemical activity that takes place and the diff between the chemical activity taking place in primary cell and secondary cell. Can anyone explain me this?

Aneeja said: (Sep 11, 2013)  
It's not about the chemical activity that differs primary cell and secondary.

The chemical reactions in secondary can be reversible, so charging and discharging both are possible.

In primary reactions can't be reversible, so only discharging possible.

Vids said: (Dec 31, 2013)  
What is transformer?

Kameshwar said: (Feb 2, 2014)  
Transformer is a device that convert AC to DC.

Visveswaran said: (Apr 4, 2014)  
I won't agree with @Kameshwar answer.

Actually transformer is device which converts AC to AC.

Conversion of AC to DC by using rectifier.

Vijender said: (May 19, 2014)  
Actually transformer is a device which is used to step up and step down the voltage bcs we need only 220 volt for home issues or appliances. So to convert high voltage to low voltage we simply use transformer.

Arfiya Khan said: (Oct 22, 2014)  
Transformer is a device which is used to step up and step down the voltage.

Rectifiers are used to convert AC to DC where.

Thyristors are used to convert dc to ac where in big industries.

IGBT are used to convert DC to AC here we can use frequency up to 1000 HZ.

Shiva said: (Dec 25, 2014)  
Hello sir transformer is a basic, it will changes the level of voltage.

Asha said: (Feb 20, 2015)  
Whats wrong with you @Kameshwar is transformer is converts AC to DC?

Transformer is step up and step down the voltage that's all. Just think and type the answer.

Manish said: (Sep 21, 2015)  

Transformer is used to step up and step down the voltage. We need a rectifier for the conversion purpose of ac to dc.

Joyti Saxena said: (Nov 21, 2015)  
Yes transformer is to step up and step down voltage.

Gopala Krishna said: (Dec 29, 2015)  
Transformer is transfer the electrical energy from one circuit to another circuit with out any changing frequency.

Aniket said: (Jan 1, 2017)  

Transformer is converted user need voltage in the form step down and step up high or low.

Sneha said: (Jun 9, 2017)  
Thank You @Arfiya khan.

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