Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 820 · 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 50° to 90°. How many degrees does it turn?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
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 110° to 20°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.🦾 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 up and left (d) points left
16. 16.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
20. 20.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
22. 22.🦾 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 straight up (d) points left
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
28. 28.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
33. 33.🦾 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 up and left (c) points up and right (d) points left
34. 34.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
37. 37.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False

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