Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 979 · 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.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
2. 2.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
3. 3.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 100
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
8. 8.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
13. 13.🦾 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 right (c) points up and left (d) points left
14. 14.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
15. 15.🦾 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 right (b) points up and left (c) points up and right (d) points straight up
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 30
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
29. 29.🦾 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
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
33. 33.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points straight up (c) points left (d) points up and left
38. 38.True or false: “drives the wheels” is true of a DC 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 180°. Where does the arm point? (a) points up and left (b) points left (c) points straight up (d) points right
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

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