Have a look at this link:
http://www.physicsclassroom.com/class/circuits/U9L3a.cfm
Look at the first 3 parts of the lesson: Journey of a Typical Electron, Resistance and Ohm's Law.
Complete the practice questions to check understanding.
If there are any parts that seem difficult or you don't understand, feel free to email questions. If the same questions keep coming up, I'll post an explanation on the blog.
Remember the address is westfieldacademyscience [at] gmail [dot] com
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