IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: gaurav95 on May 04, 2010, 07:23:33 am

Title: Physics
Post by: gaurav95 on May 04, 2010, 07:23:33 am

Can somebody help me in electronics I dont understand anything?esp.transistors which current is amplified why????What is diode ,What is Half-wave/fullwave rectification,What is time base in CRO.and thermistors also.......thx

Title: Re: Physics
Post by: Saladin on May 04, 2010, 08:04:10 am

Transistors (http://www.physlink.com/education/askexperts/ae430.cfm)

A diode is a device that turns AC current into DC current.

A half wave rectifier will block off alternating current:

(http://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/Halfwave.rectifier.en.png/500px-Halfwave.rectifier.en.png)

A full wave will make that half into the same direction:

(http://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Gratz.rectifier.en.png/500px-Gratz.rectifier.en.png)

For CRO, this is a nice site:
CRO AND TIME BASE (http://www.kpsec.freeuk.com/cro.htm#timebase)