Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 3 · 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: “turns to an exact angle” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
3. 3.🦾 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 left (b) points right (c) points straight up (d) points left
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
5. 5.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 50
   angle = angle − 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 30
   angle = angle + 20
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 right (b) points up and right (c) points left (d) points up and left
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
20. 20.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 30
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 up and left (d) points right
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
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 80° to 0°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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