Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 116 · 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 moves from 40° to 0°. How many degrees does it turn?
2. 2.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
3. 3.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle + 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 20
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
16. 16.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
30. 30.🦾 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 up and left (b) points up and right (c) points right (d) points left
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 20
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 40
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 40
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
39. 39.🦾 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 up and right (b) points straight up (c) points right (d) points up and left
40. 40.🦾 A servo moves from 170° to 10°. How many degrees does it turn?

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