Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 929 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
2. 2.🦾 A servo program runs:
   angle = 20
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
4. 4.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points up and right
14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle + 10
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
20. 20.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up
22. 22.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
27. 27.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
35. 35.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
38. 38.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

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