Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 179 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
3. 3.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
5. 5.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 70
   angle = angle + 30
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 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 up and left (b) points right (c) points left (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
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 straight up (b) points left (c) points up and left (d) points right
14. 14.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
22. 22.🦾 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 right (b) points left (c) points up and left (d) points right
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
29. 29.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
31. 31.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
32. 32.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
33. 33.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
39. 39.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo moves from 110° to 90°. How many degrees does it turn?

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