Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 273 · 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 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 right (c) points straight up (d) points up and left
2. 2.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
6. 6.🦾 A servo program runs:
   angle = 140
   angle = angle + 20
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.🦾 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 left (b) points up and right (c) points right (d) points straight up
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
20. 20.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
21. 21.⚙️ 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
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
24. 24.🦾 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 left (b) points up and left (c) points right (d) points up and right
25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
29. 29.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
30. 30.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
31. 31.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 left (c) points right (d) points up and left
39. 39.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
40. 40.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red

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