Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 234 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.🦾 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 right (d) points straight up
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
8. 8.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
9. 9.🦾 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 left (b) points right (c) points straight up (d) points up and right
10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
19. 19.⚙️ 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
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
26. 26.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
27. 27.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 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 right (d) points up and left
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.🦾 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 right (d) points up and right
37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
38. 38.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor

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