Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 332 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
2. 2.🦾 A servo program runs:
   angle = 140
   angle = angle − 60
   angle = angle − 40
   angle = angle + 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 80
   angle = angle − 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 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 left (c) points up and right (d) points up and left
5. 5.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
6. 6.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
7. 7.🦾 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 straight up (c) points left (d) points up and right
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
17. 17.🦾 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 left (c) points up and right (d) points up and left
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
25. 25.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 10
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 40
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
36. 36.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor

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