xii CONSTRUCTION OF SIMPLE VOLTAIC CELLS 197 



7. Give a description of the voltaic cells named after the following 

 physicists : 



(a) Daniell. (c) Bunsen. 



(ft) Grove. (d) Leclanehe. 



8. What chemical changes occur in a simple voltaic cell ? 



9. What is the object of the nitric acid in a Grove's cell ? 



10. Sketch the chemical changes which occur between the zinc 

 and copper plates in a Daniell's cell. 



11. Compare the flow of an electric current with the passage of 

 heat from a hot to a cold body. 



12. Describe experiments to show that the electric current can do 

 work. 



