Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 461 · 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 servo motor. (a) False (b) True
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 20
   angle = angle − 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle + 60
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
7. 7.⚙️ 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
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 left (b) points straight up (c) points up and right (d) points right
9. 9.🦾 A servo program runs:
   angle = 170
   angle = angle − 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
11. 11.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
13. 13.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.🦾 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 right (b) points left (c) points up and left (d) points right
31. 31.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
32. 32.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 30° to 120°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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