Basic configurations #1 - Wheatstone bridge

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I hope you like this kind of basic tutorial about the Wheatstone bridge. Soon I'll make more about other topics. Check the links below for more information and the mathematics behind this circuit.

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#wheatstone
#bridge
#resistance

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beautiful tutorial, the formulas explained very well and simple to understand!

mancioM

There's a mistake on 4:43. The strain gauge resistance must be 20 ohm, just like R3, for a bridge to be balanced.
Also on 5:30, the more temperature you apply, the more resistance increases. So, for example, it must increase to 22 ohms. But you're showing that it decreases. Otherwise very good, clear explanation! Thank you, dude!

RS_

good explanation, but you should mention that the big advantage of the wheatstone bridge is that the voltmeter actually shows the small deviation from the equilibrium and thus you can use a much more sensitive measurement range. In your example of 20 ohm resistors (quite low value by the way) if you would only measure one resistor which changes from e.g. 20 ohm to 20.2 ohm than this would only be a change of 1% seen on the last decimal on a regular multimeter. Even if you just measure the voltage on the right side, you end up with an unuseable value of just 5.02 V, also here the important information is hidden in the last digit of the multimeter. However, if you measure the difference between the two voltages, you get a value of 25 mV which you even might be able to read with an addition decimal in the millivolt range of your multimeter.

uwezimmermann

I was stuck on this problem for hours. Thank you for the clear explanation!

FreshRedRanger

Great concise clear explanation. Loved the animations.

navalenigma

Thank you for saving my life with this video. Those fucking physics teachers in my country just taught me to check the ratio between the resistances of resistors without any explanations.

maichiao

Your videos are so SO good and well explained! I love your style of explanation where you sandwich the theory in between practical usage and that makes it really easy to follow and understand. Thanks for making these videos!

lakshyagoyal

Great video have watched almost all on YouTube found this one the easiest and most practical to understand

OTPOTPOTP

I was just looking for something like this but didn’t know it could be made this simple! I need to use a thermocouple to read temperature with a arduino but the resistance change over the thermocouple is too small to be noticed. Thanks and great timing :)

pargunar

The main goal of this video is how to eliminate temperature effects from our sensors. No one of the professors on our faculty could explained like that.

sadecemuhendiss

Nice clear and concise explanation and demonstration!

airwavested

Three words, clear and beautiful. Thanks!

Fogaata

Nice explanation, but using quarter wheatstone bridge as u showed in this video doesn't solve the problem with temperature messing up the measurement, because it's very likely that resistors used in this bridge will have different temperature coefficient than the strain gauge. We should use the half bridge instead, so 2 strain gauges, to make sure that the changing temperature won't mess up our mesurements, am
I right?

dominikworkshop

but R1, R2 and R3 are not effected by the same temperature that was given to the Thermistor, so they are not all effected at the same time like you said in the minute before. how can you explain this ?

noureldeenkoubar