Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 106 · 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: “spins round and round” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 70
   angle = angle − 10
   angle = angle + 50
   angle = angle + 50
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ 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
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
13. 13.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
14. 14.🦾 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 right (c) points up and left (d) points left
15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
20. 20.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 10
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
24. 24.🦾 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 straight up (d) points left
25. 25.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
26. 26.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
29. 29.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
30. 30.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 left (b) points up and left (c) points up and right (d) points right
36. 36.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
37. 37.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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