Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 456 · 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 = 70
   angle = angle − 40
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
12. 12.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 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 right (d) points left
16. 16.🦾 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 right (c) points up and right (d) points straight up
17. 17.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 40
    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 servo motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ 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
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
25. 25.🦾 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 straight up (d) points up and left
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor

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