Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 720 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
3. 3.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 150
   angle = angle + 10
   angle = angle + 20
   angle = angle − 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
13. 13.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points up and left (c) points up and right (d) points right
15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 20
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
26. 26.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points right
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 10
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False

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