Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 262 · 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 170° to 20°. How many degrees does it turn?
2. 2.🦾 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 right (c) points up and left (d) points straight up
3. 3.🦾 A servo program runs:
   angle = 150
   angle = angle − 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle − 20
   angle = angle + 50
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 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 right (c) points straight up (d) points left
18. 18.🦾 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 right (b) points up and left (c) points up and right (d) points left
19. 19.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 40
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 20
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
28. 28.🦾 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 left (b) points up and left (c) points right (d) points up and right
29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 40
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
36. 36.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 170° to 130°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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