Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 10 · 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 spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.🦾 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 straight up (c) points up and right (d) points left
4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
19. 19.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
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 straight up (c) points up and left (d) points left
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
25. 25.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
27. 27.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
28. 28.⚙️ 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
29. 29.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
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 moves an arm joint? (a) a DC motor (b) a servo motor
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
35. 35.🦾 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 right (d) points up and right
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 110° to 150°. How many degrees does it turn?

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