Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 801 · 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 moves from 20° to 140°. How many degrees does it turn?
2. 2.🦾 A servo program runs:
   angle = 60
   angle = angle + 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
5. 5.🦾 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 right (d) points straight up
6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
12. 12.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
15. 15.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 straight up (c) points right (d) points left
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
25. 25.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
26. 26.🦾 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 right (c) points up and left (d) points straight up
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
37. 37.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
40. 40.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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