Extra Explaining Question - CURRENT ELECTRICITY

CURRENT ELECTRICITY

1. (a) What is meant by ‘earthing’ an appliance? Why are appliances earthed?
   (b) Explain why touching the live wire of an appliance is dangerous?


2. Explain why the resistance of a filament lamp increases as the current flowing through the lamp increases?


3. Hamis designed a circuit for lighting bulbs at home by using copper wires. But when he switched on the circuit bulbs looks dim. Explain the possible mistakes done by Hamis on why the bulbs looks dim and not bright?


4. Why copper wires are commonly used as connecting wires?


5. Explain why resistance of a conductor increases in the increases of
   1. Temperature
   
   
   2. Length of a conductor
   
   
6. In form III project of designing the electrical installation in a class they suggested to use thicker wires so as to enable bright light of the lamps.
   1. Explain why copper wires are suitable in electric circuits
   
   
   2. Suggest the other two (2) ways that can be used to produce bright light in lamps or bulbs
   
   
7. Explain four (4) ways could be used to increase the resistance of a conductor in a circuit.


8. Assume you are an electrical technician in a certain place asked to identify the problem of short circuit in a given school. How would you identify the problem?