Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 771 · 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.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
2. 2.🦾 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 straight up (c) points up and left (d) points right
3. 3.🦾 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 up and right (c) points right (d) points straight up
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 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 straight up (c) points up and left (d) points right
6. 6.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 50
   angle = angle + 20
   angle = angle + 30
   angle = angle − 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
15. 15.🦾 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 straight up (b) points up and right (c) points right (d) points left
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
24. 24.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 60
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
30. 30.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
36. 36.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
39. 39.🦾 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 up and right (b) points straight up (c) points left (d) points right
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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