Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 744 · 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 = 80
   angle = angle + 10
   angle = angle − 20
   angle = angle − 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 left (c) points up and right (d) points straight up
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 30
   angle = angle − 20
   angle = angle + 50
   angle = angle − 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 20
   angle = angle + 50
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
11. 11.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
12. 12.🦾 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 right (b) points up and right (c) points straight up (d) points left
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 60
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
16. 16.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 20
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.🦾 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 right (c) points up and left (d) points left
21. 21.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 50
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
24. 24.⚙️ 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
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    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 90°?
28. 28.🦾 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 up and left (c) points left (d) points right
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
30. 30.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 40
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
34. 34.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
36. 36.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
38. 38.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True

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