Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 91 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
4. 4.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
7. 7.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
8. 8.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ 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
13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 40
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 60
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
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 moves from 10° to 30°. How many degrees does it turn?
23. 23.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
24. 24.⚙️ 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
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 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 straight up (b) points up and left (c) points left (d) points right
30. 30.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
31. 31.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 left (d) points straight up
39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True

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