modified 9 years ago

Wheatstone bridge

01:08:41

Determining the resistance of a lamp using the principle of wheatstone bridge.
 the second circut demonstrates ohms law, while the first circuit calculates resistance using wheatstone bridge principle 

published 9 years ago

eeveleigh

9 years ago

Cool stuff. It seems using your circuit that EC implements the lamp using a pure resistance. In a real lamp the filament has an increasing resistance when it heats up so the more current running through the lamp, the higher the resistance is. In this way it can actually be used as a form of negative feedback in circuits like the wien bridge oscillator.

rich11292000

9 years ago

EC doesnt simulate heat. Everything would add resistance as it heats up. A good example is the conductor sizing in 3rd world countrys. In Afghanistan instead of using a 50 amp fuse to prevent damage upstream from a current surge, they use undersized wiring so the conductors are incapable of exceeding the desired amperage. For a 50 amp house drop they use wire I would use on a 20 amp fuse. So when they are running 40 amps and try add an additional 10 amps they could end up using 39 instead of 50 because the extreme heat build up decreasing the wires ampacity.

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