Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 241 · 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 135°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
2. 2.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
4. 4.⚙️ 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
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
12. 12.🦾 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 up and right (d) points straight up
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.⚙️ 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
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
22. 22.🦾 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 up and right (b) points up and left (c) points straight up (d) points left
23. 23.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
25. 25.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
29. 29.🦾 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 left (b) points up and left (c) points right (d) points up and right
30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 40
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

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