The graphs below show characteristics of electrical components.


1. Which of the graphs above shows how the current (y axis) varies with the voltage applied for a resistor that obeys ohm's law? 

2. Which of the graphs above shows how the voltage (y axis) varies with time as a capacitor is discharged ? 

3. Which of the following graphs shows how the resistance of a filament lamp varies with voltage?


4. A circuit is set up to investigate the IV characteristics of a bulb, over the full range of voltage available . It includes a variable resistor used as a potential divider.
Which of these shows the correct arrangement of the components?


5. 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. m^{2}
 E. 1/m



These 4 resistor networks are made using identical resistors.


6. Which network has the highest resistance? 

7. Which network would have the largest current flowing through it when connected to identical cells? 

A battery of e.m.f. 12V ( and negligible internal resistance) is connected to a resistor.
30C of charge flows through the resistor in one minute. 


8.What is the current flowing?
 A. 0.2A
 B. 0.4A
 C. 0.5A
 D. 2A
 E. 2.5A


9. What is the power dissipated in the resistor?
 A. 2.5W
 B. 6W
 C. 24W
 D. 130W
 E. 360W


10. What is the value of the resistor?
 A. 0.4 Ω
 B. 2.5 Ω
 C. 12 Ω
 D. 20 Ω
 E. 24 Ω



