Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 7 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
4. 4.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
7. 7.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
8. 8.🦾 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 right (b) points left (c) points up and right (d) points straight up
9. 9.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 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 left (b) points up and right (c) points straight up (d) points right
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.🦾 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 right (b) points left (c) points straight up (d) points up and left
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True

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