Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 335 · 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: “holds a set angle” is true of a DC motor. (a) True (b) False
2. 2.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 0
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.🦾 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 up and right (c) points left (d) points straight up
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 program runs:
   angle = 80
   angle = angle − 50
   angle = angle + 50
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
12. 12.⚙️ 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
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    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 30°?
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
28. 28.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
29. 29.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 150° to 140°. How many degrees does it turn?
32. 32.🦾 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 right
33. 33.🦾 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 straight up (c) points right (d) points up and right
34. 34.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 60
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor

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