Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 169 · 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.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
2. 2.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
5. 5.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
7. 7.🦾 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 right (c) points left (d) points up and left
8. 8.🦾 A servo program runs:
   angle = 60
   angle = angle − 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 60
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 120° to 140°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle + 10
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 right (b) points up and left (c) points straight up (d) points left
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 up and left (b) points left (c) points right (d) points straight up
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 20
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?

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