Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 545 · 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 servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC 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 straight up (b) points up and right (c) points up and left (d) points right
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 0
   angle = angle + 60
   angle = angle − 20
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
10. 10.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 30
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
16. 16.🦾 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 up and left (b) points straight up (c) points up and right (d) points right
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
19. 19.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
24. 24.🦾 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 straight up (c) points right (d) points up and left
25. 25.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
28. 28.🦾 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 left (b) points up and right (c) points up and left (d) points right
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
38. 38.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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