Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 629 · 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 120°?
2. 2.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle + 10
   angle = angle − 50
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
8. 8.🦾 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 up and right (c) points straight up (d) points right
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
11. 11.🦾 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
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 20° to 100°. How many degrees does it turn?
17. 17.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
23. 23.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.🦾 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 up and left (b) points left (c) points straight up (d) points up and right
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 30
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False

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