Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 493 · 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 90°?
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle + 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
7. 7.🦾 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 right (b) points straight up (c) points left (d) points up and right
8. 8.🦾 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 right (c) points up and right (d) points left
9. 9.🦾 A servo program runs:
   angle = 80
   angle = angle + 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
11. 11.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
17. 17.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
20. 20.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 40
    angle = angle + 60
    angle = angle − 10
    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 180°. Where does the arm point? (a) points straight up (b) points right (c) points up and right (d) points left
37. 37.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 60
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 100° to 140°. How many degrees does it turn?

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