Time = 40 minutes
Total marks = 50
Solve all questions.All questions carry equal marks.
Q1. What is the difference between a positive and a negative charge?
Q2. How does an object become charged by rubbing? Give an example.
Q3. What is electric current, and what does it represent in a circuit?
Q4. How do we measure electric current?
Q5. What happens to the current when you add more lamps to a simple series circuit?
Q6. What is the function of the battery in an electric circuit?
Q7. In the rope model, how is energy transferred?
Q8. What limitation does the water circuit model have when explaining electric circuits?
Q9. You have one cell and two identical lamps in series. The current measured by the
ammeter is 0.2 A.
Question: What is the current through each lamp?Explain.
Q10. In a circuit with 1 cell and 1 lamp, the current is 0.3 A. You add another identical cell.
Question: Will the current increase, decrease, or stay the same? Explain.
Q11. Why does the current decrease if more lamps are added to a series circuit?
Q12. In a series circuit with two lamps and one battery, the current is measured to be 0.4
A. If one lamp is removed, predict what will happen to the current. Explain why.
Q13. In the water circuit model, what do the pump and the tap represent in an electric
circuit?
