Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 913 · 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) sound only (b) light (c) water (d) movement
2. 2.🦾 A servo program runs:
   angle = 120
   angle = angle − 30
   angle = angle + 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 120
   angle = angle − 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo program runs:
   angle = 100
   angle = angle − 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
12. 12.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
15. 15.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
16. 16.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points up and right (c) points straight up (d) points left
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 left (b) points straight up (c) points right (d) points up and left
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
23. 23.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 50
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 20
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
30. 30.⚙️ 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
31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
33. 33.🦾 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 left (c) points left (d) points up and right
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (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.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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