Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 232 · 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: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 40
   angle = angle + 60
   angle = angle + 60
   angle = angle − 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
11. 11.🦾 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 up and right (c) points left (d) points right
12. 12.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
14. 14.🦾 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 left (d) points right
15. 15.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
18. 18.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
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 = 40
    angle = angle + 50
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 40
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 50° to 10°. How many degrees does it turn?

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