1. Draw a labelled diagram of a Hydrogen Atom. The following labels shoud appear.
   Small, Heavy, Light, Electron, Nucleus, Proton, Negative, Positive.
   
   
   
   
   
   
   
   
   
   
    
2. If an electron is removed from a neutral atom, what kind of charge does the atom have?
   
   
   
    
3. Describe an electric current in a wire.
   
   
   
   
   
4. When an object is NOT charged, what can you say about the negative electrons and the positive nuclei in the object.
   
   
   
    
5. What is meant by a negative ion? In your answer, mention electrons and protons.
   
   
   
    
6. Describe the most important property of electrons in an insulator.
   
   
   
    
7. Describe the most important property of electrons in a conductor.
   
   
   
    
8. Which category of materials ALL conduct electricity very well?
   
   
   
    
9. In a crystal of totally pure silicon, how many electrons are there in the outer shell of each atom?
   
   
   
    
10. In N type silicon, how many electrons are there in the outer shell of each dope / impurity atom?
    
    
    
     
11. In P type silicon, how many electrons are there in the outer shell of each dope / impurity atom?
    
    
    
     
12. Give examples to explain the difference between silicon and silicone?
    
    
    
     
13. List four potentially fatal dangers from short circuits.
    
    
    
    
    
    
    
    
     
14. The unit for measuring Current is _____________
    
     
15. The unit for measuring Potential Difference is _____________
    
     
16. The unit for measuring Charge is ___________