Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 950 · 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 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 left (b) points left (c) points right (d) points straight up
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
3. 3.🦾 A servo program runs:
   angle = 30
   angle = angle + 60
   angle = angle − 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.🦾 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
7. 7.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
8. 8.🦾 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
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
10. 10.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
11. 11.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
12. 12.⚙️ 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
13. 13.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
26. 26.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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