Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 139 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
6. 6.🦾 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 straight up (b) points right (c) points left (d) points up and right
7. 7.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.🦾 A servo program runs:
   angle = 10
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
13. 13.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
14. 14.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
18. 18.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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 straight up (b) points up and left (c) points right (d) points left
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
28. 28.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
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 right (d) points up and left
32. 32.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 50
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 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 straight up (b) points up and left (c) points left (d) points right
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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