Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 486 · 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 DC motor. (a) True (b) False
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
3. 3.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.⚙️ 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
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 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 up and right (d) points right
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
16. 16.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 30
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
31. 31.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
32. 32.🦾 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 straight up (d) points right
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ 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
36. 36.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 50
    angle = angle − 50
    angle = angle − 10
    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 servo motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

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