Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 709 · 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 motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
2. 2.🦾 A servo program runs:
   angle = 110
   angle = angle + 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 40
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 left (b) points straight up (c) points up and right (d) points right
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.⚙️ 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
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 right (c) points up and left (d) points left
23. 23.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
38. 38.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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