Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 943 · 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 60° to 180°. How many degrees does it turn?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
4. 4.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
5. 5.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 40
   angle = angle + 20
   angle = angle − 10
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo program runs:
   angle = 70
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
12. 12.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
13. 13.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.🦾 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 up and right (b) points left (c) points straight up (d) points right
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
23. 23.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
25. 25.🦾 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 left (b) points up and right (c) points straight up (d) points right
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
37. 37.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 120° to 150°. How many degrees does it turn?
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False

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