Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 751 · 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 program runs:
   angle = 180
   angle = angle − 30
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 up and right (c) points straight up (d) points right
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
7. 7.🦾 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 left (b) points left (c) points up and right (d) points right
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.🦾 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 straight up (b) points left (c) points up and right (d) points right
14. 14.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 right (c) points up and left (d) points straight up
23. 23.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
29. 29.🦾 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
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 30
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
37. 37.🦾 A servo moves from 130° to 160°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo moves from 100° to 110°. How many degrees does it turn?

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