Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 474 · 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: “has a signal wire” is true of a DC motor. (a) True (b) False
2. 2.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
3. 3.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle + 50
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 40
   angle = angle + 30
   angle = angle + 20
   angle = angle − 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
8. 8.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
9. 9.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
11. 11.🦾 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 left (b) points straight up (c) points up and right (d) points left
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
13. 13.🦾 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 left (b) points up and right (c) points up and left (d) points right
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.🦾 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 right (d) points left
22. 22.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
23. 23.⚙️ 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
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True

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