Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 147 · 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 left (b) points right (c) points straight up (d) points up and right
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 60
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 90
   angle = angle − 30
   angle = angle − 10
   angle = angle + 30
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.⚙️ 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
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.🦾 A servo moves from 180° to 50°. How many degrees does it turn?
19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
27. 27.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 50
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 10
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 right (c) points straight up (d) points up and right
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.True or false: “has just two wires” 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 135°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points up and right
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
40. 40.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True

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