 µ IB | Circuit Basics

10 quick questions

10 minutes maximum! (can you do it in 5?)

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

 Ammeter Voltmeter A series series B parallel series C series parallel D parallel parallel

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 negligable internal resistance. Which of these gives the power lost as heat in the resistor, and the current flowing through it?

 Power (W) Current (A) A 36 4 B 36 0.25 C 48 4 D 48 0.25

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 potential difference (V) across a component at different currents (I). 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