Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 191 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo program runs:
   angle = 150
   angle = angle + 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.🦾 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 straight up (b) points right (c) points up and right (d) points left
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 right (b) points right (c) points straight up (d) points up and left
7. 7.🦾 A servo program runs:
   angle = 10
   angle = angle + 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo program runs:
   angle = 100
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
20. 20.🦾 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 left (c) points up and left (d) points straight up
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
26. 26.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.🦾 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 right (c) points up and left (d) points straight up
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
37. 37.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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