Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 884 · 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 spins faster with more V? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 140° to 30°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.True or false: “moves an arm joint” is true of a servo 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 0°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points left
14. 14.🦾 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 right (b) points left (c) points right (d) points up and left
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
20. 20.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
21. 21.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 50
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 30
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
34. 34.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
36. 36.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
39. 39.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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