10 minutes maximum! Can you do it in 5?

1. Resistance is measured in 'Ω'. This is the symbol for ...

  • A. watts.
  • B. ohms.
  • C. resists.
  • D. coulombs.

2. Which of these formulas is used to calculate resistance?

  • A. resistance = voltage x (current)2
  • B. resistance = voltage ÷ current
  • C. resistance = current ÷ voltage
  • D. resistance = voltage x current

3. 0.3 kΩ is the same as ...

  • A. 3Ω
  • B. 30Ω
  • C. 300Ω
  • D. 3000Ω
4. What is the resistance of this resistor? resistor calculation diagram
  • A. 0.2Ω
  • B. 2Ω
  • C. 5Ω
  • D. 80Ω
5. What current flows in this circuit? bulb and cell calculation, diagram
  • A. 0.2A
  • B. 2A
  • C. 5A
  • D. 150A
 

6. What is '2mA' in amps?

  • A. 2000A
  • B. 200A
  • C. 0.02A
  • D. 0.002A
  
7. What is the voltage of this power supply shown in the circuit diagram?
  • A. 1.5 mV
  • B. 6V
  • C. 15V
  • D. 6000V
8. A steel wire has a resistance. Which of these correctly describes the change to the resistance if the wire is made longer, or thicker? (with a bigger radius).  
Longer wire Thicker wire
A
 higher resistance lower resistance
B
 lower resistance higher resistance
C
 lower resistance lower resistance
D
 higher resistance higher resistance

Q9 & 10.

In this circuit, a single resistor R is connected to a cell. The total current is given by the ammeter shown.

 
9. If I change the circuit and put 2 of these resistors in series, what happens?
  • A. The current increases as the total resistance increases.
  • B. The current increases as the total resistance decreases.
  • C. The current decreases as the total resistance increases.
  • D. The current decreases as the total resistance decreases.

 

10. How does the total current change , compared to a single resistor, if I put 2 of the resistors in parallel?

The total current is .