16-18: A computer circuit board contains a 4Ω resistor and has a current of 2A flowing through it when 8V is applied. circuit board

16. What is the charge flowing through it every 10 seconds?

  • A) 40 C
  • B) 20 C
  • C) 80 C
  • D) 0.8 C

17. The resistor gets hot. What is the power produced?

  • A) 16 W
  • B) 8 W
  • C) 32 W
  • D) 2 W

18. What is the heat energy transferred to the resistor (the work done) over the 10 seconds?

  • A) 64 J
  • B) 160 J
  • C) 320 J
  • D) 20 J

19. Which type of circuit is more suitable for the following 2 applications?

 

A switch to turn a motor on and off.

The motor and switch are in...

Domestic lighting.

All lights are wired in...
A)
series
series
B)
series
parallel
C)
parallel
series
D)
parallel
parallel

20. To get a large current to flow in a buzzer, you can either

  • A) Increase the resistance or increase the voltage.
  • B) Increase the resistance or decrease the voltage.
  • C) Decrease the resistance or increase the voltage.
  • D) Decrease the resistance or decrease the voltage.

21. Which of these circuits will draw the largest current from a cell? Assume all bulbs are identical.

  • A) 2 bulbs in parallel
  • B) 2 bulbs in series
  • C) 3 bulbs in series
  • D) 1 bulb on its own

22. Which of these answers gives the correct change in resistance for each component?

 
L.D.R. in strong light .
Thermistor in a hot room.
A)
Resistance increases
Resistance increases
B)
Resistance increases
Resistance decreases
C)
Resistance decreases
Resistance increases
D)
Resistance decreases
Resistance decreases

 

Static Electricity

23 - 27. What are the missing words in this paragraph?

 plastic sheet rubbed with cloth
The plastic sheet here gains a postive charge when rubbed with a cloth.
Static electricity is produced by movement of .
In this example these particles move from when the plastic is rubbed.
A static charge normally only builds up on .
Charge is measured in .
Two objects held close together, both with positive charges, will .