Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 624 · 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 moves from 90° to 70°. How many degrees does it turn?
2. 2.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
4. 4.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
5. 5.🦾 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 left (b) points up and right (c) points right (d) points left
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
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.🦾 A servo program runs:
   angle = 150
   angle = angle + 30
   angle = angle − 20
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.🦾 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 straight up (c) points right (d) points up and right
17. 17.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 40
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
23. 23.🦾 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 straight up (b) points right (c) points left (d) points up and right
24. 24.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
35. 35.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
38. 38.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 left (d) points right

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