Robotics Worksheet: DC and Servo Motors

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

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