Observing Energy Changes - Yr. 8
Observing Energy Changes - Yr. 8
Dear All - Has anyone had success getting a deflection on a micro-ammeter or multimeter using a length of Nichrome wire and two lengths of copper wire (ends cleaned!) Join one end of each copper wire to each end of the Nichrome wire by twisting together and the copper wire ends to the multimeter or micro-ammeter. Put one junction into a beaker of crushed ice and the other junction into a bunsen flame and heat to red hot. Should get a deflection! Anyone had any luck? Your input would be appreciated. Thanks. Jude
Re: Observing Energy Changes - Yr. 8
Our kids do the same practical and they seem to get a reading on multimeter.
Lada
Lada
Re: Observing Energy Changes - Yr. 8
Thank you for that Lada, we are not having any success!! What thickness is the wire? The wire we are using is 22swg, maybe it is too thick? Any tips? Cheers. Judy
- Ian
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Re: Observing Energy Changes - Yr. 8
I would not even bother with the iced junction. Just use TWO dissimilar metal wires with ONE junction Wrap the copper and Iron (or NiCr) wire together and heat the junction in a strong bunsen flame.
I have just done it this way and got about 20 micro (u) amps without even cleaning the ends of the wires!
Cheers
Ian
I have just done it this way and got about 20 micro (u) amps without even cleaning the ends of the wires!
Cheers
Ian
Re: Observing Energy Changes - Yr. 8
And try a galvanometer instead.
Re: Observing Energy Changes - Yr. 8
Thanks everyone - I'll ditch the ice junction and try again with the multimeter/micro-ammeter see if that helps and if not try the galvanometer. You've been most helpful. Cheers. Judy
Re: Observing Energy Changes - Yr. 8
I bought some lovely little thermocouple rigs from Scientriffic that even have banana plug outlets on them, and they worked like a dream!
Cheers, K
Re: Observing Energy Changes - Yr. 8
Success at Last!!!! Thanks guys. Jude