Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 946 · 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 = 100
   angle = angle + 40
   angle = angle − 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo program runs:
   angle = 70
   angle = angle + 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 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 straight up (b) points up and left (c) points left (d) points right
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 right (b) points left (c) points up and right (d) points up and left
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
34. 34.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

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