Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 432 · 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: “drives the wheels” is true of a DC motor. (a) True (b) False
2. 2.🦾 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 up and left (b) points up and right (c) points left (d) points straight up
3. 3.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
5. 5.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
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 left (c) points straight up (d) points up and right
8. 8.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
10. 10.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
11. 11.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
18. 18.🦾 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 up and left (d) points up and right
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
24. 24.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
40. 40.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False

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