Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 285 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
8. 8.⚙️ 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
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 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 straight up (b) points up and left (c) points right (d) points left
15. 15.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
21. 21.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
26. 26.🦾 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 straight up (c) points up and right (d) points right
27. 27.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
33. 33.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
34. 34.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 30
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
38. 38.True or false: “turns to an exact angle” 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 right (b) points up and left (c) points left (d) points up and right
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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