Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 436 · 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 program runs:
   angle = 0
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.🦾 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 up and left (c) points left (d) points right
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
19. 19.🦾 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 left (c) points right (d) points straight up
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
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 up and left (b) points straight up (c) points right (d) points left
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 40
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
32. 32.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True

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