2. Current / Voltage Graphs: Answers The marks for each question appear in red boxes alongside the answer

3. V I -V -I Complete this graph to show the relationship between voltage and current for a filament lamp. 20 s Question 1

4. V I -V -I Complete this graph to show the relationship between voltage and current for a filament lamp. 20 s Question 1 2

5. I V -I -V Complete this graph to show the relationship between voltage and current for a diode. Question 2

6. I V -I -V Complete this graph to show the relationship between voltage and current for a diode. s Question 2 2

7. Voltage (V) Current (A) This graph shows the variation in voltage and current for a fixed resistor. Calculate the resistance 1 2 4 3 10 8 6 4 2 Question 3

8. Voltage (V) Current (A) Gradient = V/I so gradient = resistance Gradient = 8/2 = 4 So resistance = 4  1 2 4 3 10 8 6 4 2 1 min Question 3 2

9. Current (mA) Voltage (V) 1 2 4 3 100 80 60 40 20 This graph shows the variation in voltage and current for a fixed resistor. Calculate the resistance Question 4

10. Current (mA) Voltage (V) 1 2 4 3 100 80 60 40 20 Gradient = I / V so Gradient = 1/resistance Gradient = 0.06/4.5 (current in mA) = 0.013333 1.5 min Question 4 So resistance = 1/ 0.01333 resistance = 75  4

11. Which circuit best allows you to determine Current / Voltage relationships A B Question 5

12. Circuit B, because it allows you to apply voltages right down to 0V B Question 5 1

13. Will this diode conduct or not ? 10 s Question 6 Yes, it is said to be forward biased. 1

14. Which bulbs will light ? Question 7 Only bulb C will light. 1

15. Write down the Ohm’s Law Equation. Question 8 V = IR 1

16. This bulb has a resistance of 2  Calculate the reading on the ammeter. 9V Question 9

17. V = IR so I = V/R I = 9/2 I = 4.5 A 9V Question 9 2

18. When current enters at ‘A’ it leaves at ____ When current leaves at ‘A’ it entered at ____ When current enters at ‘B’ it leaves at ____ When current leaves at ‘B’ it entered at ____ Question 10 C D C D 4

19. End Of Answers Add up your total out of... 20