Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 640 · 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 0° to 60°. How many degrees does it turn?
2. 2.🦾 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 up and left (c) points left (d) points right
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
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 up and right (c) points straight up (d) points left
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
10. 10.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
11. 11.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 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 right (b) points up and right (c) points left (d) points straight up
13. 13.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 30
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
21. 21.🦾 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 right (b) points left (c) points straight up (d) points up and right
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 10
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
40. 40.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan

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