Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 185 · 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: “has a signal wire” is true of a DC motor. (a) True (b) False
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
4. 4.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
15. 15.🦾 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 up and left (c) points left (d) points straight up
16. 16.🦾 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 up and right (c) points right (d) points left
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 30
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
26. 26.🦾 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 up and right (c) points right (d) points up and left
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
33. 33.⚙️ 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
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
40. 40.🦾 A servo moves from 50° to 60°. How many degrees does it turn?

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