Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 465 · 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 130° to 110°. How many degrees does it turn?
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 60
   angle = angle + 20
   angle = angle − 30
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 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 straight up (c) points left (d) points right
13. 13.🦾 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 straight up (b) points left (c) points up and left (d) points up and right
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🦾 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 up and right (b) points up and left (c) points left (d) points right
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
31. 31.🦾 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 right (c) points up and right (d) points straight up
32. 32.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
33. 33.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
34. 34.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 60
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 50° to 160°. How many degrees does it turn?

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