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| Resistance due to movement of electrons
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Excellent animation of conductors, resistors and insulators in the first two minutes. But after that it starts to ramble. Youtube |
4 Star |
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| Resistance
at molecular level
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Nice applet which shows what's going on at a molecular level in a filament bulb, although it is somewhat simplified. Can you say why? |
4 Star |
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Example of a non-ohmic conductor |
A pickle (but don't write this on your exam paper!) Short video clip - don't try this at home. |
4 Star |
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| Why metals conduct electricity | Link | Nice animation from absorblearning.com | 4 Star |
| Why voltage causes a current | Link | Nice animation from absorblearning.com | 4 Star |
| Resistance and Temp | Nice animation (take your time to understand it) to explain why resistance increases with temperature. From absorblearning.com | 4 Star | |
| Ohm’s Law Applets: | One of the best. Note that you can change V or R, but you can't change I directly. This is because the current that flows can only be determined after setting values for the other 2. |
5 Star |
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Very good simulation before you try the real thing yourself |
4 Star |
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Nice simulation, but putting the voltmeter across both the resistor and the ammeter might be confusing. |
4 Star |
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I have already included this in the Current Electricity page, but it deserves a second look. Put the circuit together yourself before trying the real thing. |
6 Star |
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| A potential divider | Diagram of a heat sensor, from absorblearning.com | 4 Star | |
| How a variable resistor works | Simple but excellent animation of a rheostat. Move the pointer by grabbing the green dot on top. |
5 Star |
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| Resistors in Series and in Parallel | Arrange Resistors in combination you want and check to see what the net resistance is. You can also check Voltage and Current values at any point. |
5 Star |
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| Resistivity
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Excellent. Play with the formula and see the variables change in the circuit |
6 Star |
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Colour coded resistor, and also a chance to see the relationship between resistance and cross sectional area |
4 Star |
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| Resistor colour codes | What it says on the tin. Play with the colours and note the value of the resistor |
3 Star |
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| Reading a Micrometer | Very user friendly, but I doubt if this can ever get asked in the Leaving Cert |
4 Star |
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| Metre Bridge | Balance the bridge and then use your formula to calculate the value of the unknown resistor |
4 Star |
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| PowerPoint Presentation | Excellent Introduction / Revision on Resistance from Maire Duffy in Clonkeen College |
5 Star |