Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 491 · 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 DC motor. (a) False (b) True
2. 2.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
4. 4.🦾 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 left (c) points up and right (d) points straight up
5. 5.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
13. 13.🦾 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 right (c) points up and left (d) points right
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
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 left (c) points up and right (d) points straight up
16. 16.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
17. 17.🦾 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 right (b) points left (c) points straight up (d) points up and right
18. 18.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
26. 26.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
29. 29.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 20
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
33. 33.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 50
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
37. 37.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor

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