10 minutes maximum! Can you do it in 5?

 1. Which of these best describes how to connect ammeters and voltmeters in a circuit?

2. Which of these statements best explains what an 'ohmic' conductor is?

• A. A conductor where the current through it is directly proportional to the potential difference.
• B. A conductor where the current through it is directly proportional to the resistance.
• C. A conductor where the resistance is proportional to the potential difference.
• D. A conductor where the power loss through heating is proportional to the potential difference.

3+4. The following diagrams are resistor networks made of 12Ω resistors:

3. Which of the above networks has the highest resistance?

4. Which of the above networks has a resistance of 4Ω?

5. A 3Ω resistor is connected to a 12V supply of negligible internal resistance. Which of these gives the power lost as heat in the resistor, and the current flowing through it?

6. Which of these statements best describes ideal ammeters and voltmeters?

• A. Ammeters and voltmeters should have zero resistance.
• B. Ammeters and voltmeters should have infinite resistance.
• C. Ammeters should have infinite resistance, voltmeters should have zero resistance.
• D. Ammeters should have zero resistance, voltmeters should have infinite resistance.

7. The graph below shows the currents (I) across a component at different potential differences (V). A tangent line labelled T has been drawn at the point labelled X.

Which of the following will give the resistance of the component at point x on the graph?

8-10. A circuit is set up as shown below:

8. What is the total resistance of the 3 resistors in this network?

• A. 1.5 Ω
• B. 3 Ω
• C. 5 Ω
• D. 9 Ω

9. What is the reading on the ammeter?

• A. 0.67 A
• B. 1 A
• C. 2 A
• D. 4 A

10. What is the p.d. across the 1Ω resistor?

• A. 1 V
• B. 2 V
• C. 3 V
• D. 4 V