Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 897 · 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 = 20
   angle = angle + 20
   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 180°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
3. 3.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
7. 7.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 140
   angle = angle − 50
   angle = angle − 40
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
15. 15.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 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 right (b) points left (c) points straight up (d) points right
18. 18.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
23. 23.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
25. 25.🦾 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 left (c) points right (d) points up and left
26. 26.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.🦾 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 left (b) points right (c) points up and right (d) points up and left
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
38. 38.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
40. 40.🦾 A servo moves from 10° to 30°. How many degrees does it turn?

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