Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 582 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle − 10
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 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 up and right (b) points left (c) points straight up (d) points right
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo program runs:
   angle = 180
   angle = angle − 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
13. 13.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle − 30
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
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 program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.🦾 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 straight up (c) points right (d) points left
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo moves from 140° to 90°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
32. 32.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
39. 39.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
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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