Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 657 · 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: “has just two wires” 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 60°?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
6. 6.🦾 A servo program runs:
   angle = 100
   angle = angle − 40
   angle = angle − 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.⚙️ 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
12. 12.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
14. 14.🦾 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 up and right (d) points right
15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
19. 19.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 60
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
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 right (b) points up and left (c) points straight up (d) points right
27. 27.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 10
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 left (d) points right
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
39. 39.🦾 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 up and left (c) points straight up (d) points right
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor

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