Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 842 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo moves from 150° to 140°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 160
   angle = angle − 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🦾 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 right (b) points left (c) points straight up (d) points up and right
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
14. 14.🦾 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 straight up (b) points up and left (c) points right (d) points up and right
15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
19. 19.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
22. 22.⚙️ 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
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
25. 25.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
28. 28.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
34. 34.🦾 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 left (b) points straight up (c) points up and left (d) points up and right
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
37. 37.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 120° to 170°. How many degrees does it turn?

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