Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 921 · 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.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 right (c) points up and left (d) points straight up
3. 3.🦾 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 left (c) points right (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.🦾 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 right (c) points up and left (d) points left
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
19. 19.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
26. 26.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 10
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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