IB Circuits - circuits and cells

page 1

 

1. Which of the following answers gives the ideal characteristics for voltmeters and ammeters?

Voltmeter Ammeter
A. Infinite resistance Infinite resistance
B. Zero resistance Infinite resistance
C. Infinite resistance Zero resistance
D. Zero resistance Zero resistance
2. Which of these is the definition of e.m.f in a circuit?
  • A. The terminal voltage of a cell
  • B. The resistance attached to the cell multiplied by the external current
  • C. The work done per unit charge moving round the circuit
  • D. The potential difference drop across the internal resistance of the cell.

3. A circuit is set up to investigate the I-V characteristics of a bulb . Which of these shows the correct arrangement of the components?

 

4. The graph shows how the current varies in an unknown component.

At x, the tangent T has a gradient of m.

The resistance of the component at x is:

 

  • A. V/I
  • B. I/V
  • C. m
  • D. 1/m

Q5&6. These 4 resistor networks are made using identical resistors.

 

 
5. Which network above has the highest resistance?
6. The 4 networks above are connected to 4 identical cells. Which would have the largest total current flowing through it ?

 

7. Which of the graphs below best describes the output of a typical cell as it is completely discharges through a fixed resistor?

8. A resistor of resistance R is connected with a cell of e.m.f. E and negligible internal resistance. The total power dissipated in the resistor is P. What would be the total power dissipated if the resistance have a value of 2R and the cell has an e.m.f. of 2E?
  • A. ½ P
  • B. P
  • C. 2P
  • D. 4P