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Physics library
Course: Physics library > Unit 18
Lesson 4: Discovery of batteries- Zinc copper cell (reduction-oxidation)
- How to measure?
- Battery meter (galvanometer)
- How Many Turns?
- Electrolyte test (pure water vs. vinegar)
- Reverse electrodes (polarity)
- Electrolyte (strong acid test)
- Electrolyte (salt test)
- Electrode (distance test)
- Electrolyte (temperature test)
- Electrode (surface area test)
- Standard cell
- How much electrolyte does a single cell need?
- The battery and electromagnetism
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Electrolyte (temperature test)
Here we experiment with hot vs. cold vinegar as our electrolyte. Does the deflection in our galvanometer depend on temperature? Why? Created by Sal Khan.
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Is this why people store batteries in the fridge? So they won't discharge as fast and might last longer?(10 votes)
When I go hiking in the mountains where it's colder, I have to take any batteries I bought (for flashlights, etc.) and put them in my sleeping bag to keep them warm. They don't work as well when they get really cold.(4 votes)
- What equipment do you need to do this experiment?(4 votes)
Hey Matthew, next week I'll be posting detail part lists and where you can find everything & ideas for how to do it as cheap as possible.(7 votes)
What does hotter temperatures have to do with dissoling solids? And what does higher temperatures have to do with kinectic energy?(3 votes)
The higher the temperature the more the molecules move around (kinetic energy). And when something is moving faster on one object, it will have more friction, thus dissolving it.(4 votes)
That's why battery equipment does not work so good in the winter.
Sometimes it works again if you heat up the battery in your hands.(3 votes)
i think that since electrolytic conductance increases with an increase in temperature,so in winter, temperaturis so low and will decrease the electrolytic conductance.(3 votes)
- Why does the introduction above the video say, "Here we experiment with hold vs cold vinegar as our electrolyte"? Shouldn't it say "HOT" vs cold instead?(3 votes)
- Yes, it's probably just a typing mistake.(1 vote)
- Before watching video: I don't think it would depend on the temp. as long as it is always the same material.
After watching video: Wow. The hot water makes a big difference.(3 votes) - does Brit talk in the electrolyte(3 votes)
(When the type of acid and distance and surface area constant) the hotter the acid is, the stronger the magnetic field is (the type of acid and distance and surface area constant)?(2 votes)
where is he geting the power(2 votes)
The 'power' is generated when the electrons want to flow from one material to another. You can see this when it bubbles up at1:13(1 vote)
- Was the second liquid hot water or hot vinegar?(2 votes)
- At0:26you can see that he writes down H for hot vinegar. And at the top it says: "Hot vs. cold vinegar." .(1 vote)
1:13