Robotics Worksheet: DC and Servo Motors

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

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