# What's the difference between a bridge rectifier and a rheostat?

Discussion in 'Radio Circuits, Repair & Performance' started by ELECTRONERD122, Feb 25, 2021.

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1. ### ELECTRONERD122QRZ Member

I started learning the ropes of electronics just a few weeks ago and my question may sound stupid for a pro like you, but I’m still going to test my luck and - hopefully - somebody here will help me out. Thin is, I’ve been trying to figure out the difference between a bridge rectifier and a rheostat. When it comes to bridge rectifiers I guess I mostly understand how it works...

What’s the biggest conceptual difference between the two? Thanks

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2. ### WA0YDEHam MemberQRZ Page

Do a search....basic electronics. Lots of info online. Get a handbook also.

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3. ### W1NBXML SubscriberQRZ Page

They are two very different components. A rheostat is generally a variable resistor, that is a resistor who's value can be changed by some mechanical or electronic means.

A bridge rectifier is an array of four diodes that converts alternating current (AC) into direct current. In a basic sense, diodes allow current to pass in one direction but blocks current from passing in the opposite direction. So, a bridge rectifier is a combination of four diodes that are configured to allow the current to pass in only one direction, converting AC to DC. The difference between a bridge and a single diode (half wave rectifier) or a two diode array (full wave rectifier), is that the additional diodes allow both the positive going and negative going peaks of a sine wave to be added to the DC, directly decreasing the amount of filtering needed to make the rectified AC smooth, rippleless DC, and indirectly increasing the current capability and, to a degree, its resulting DC voltage.

Here is a full explanation of what a rheostat is: https://eepower.com/resistor-guide/resistor-types/rheostat/

Here is a full description of a full wave bridge: https://www.electronics-tutorials.ws/diode/diode_6.html

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4. ### K1LKPPlatinum SubscriberPlatinum SubscriberQRZ Page

DEAR ELECTRON NERD,

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73 - K1LKP

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5. ### G3YROHam MemberQRZ Page

Hmm . . . I've been trying to figure out what you really mean . . .

Your question is a bit like asking what's the difference between a carburretor and a brake disc !

Perhaps there's a different word you meant to post, instead of Rheostat? (or maybe this is just a wind-up?)

Roger G3YRO

PY2RAF and K7JEM like this.

Perhaps you can start with http://ut7ut.com/ for local references for hands-on tech info? Hands-on learning very often is the very best way to learn these concepts.

Dave
W7UUU

7. ### WB2WIKPlatinum SubscriberPlatinum SubscriberQRZ Page

What's the difference between an apple?

Troll much?

9. ### KQ8WXML SubscriberQRZ Page

How is a question like this when someone is learning considered trolling?

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Last edited: Feb 25, 2021
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