Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 42 · 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 a signal wire” is true of a DC motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (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 90°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points left
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🦾 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 up and right (b) points right (c) points up and left (d) points left
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo moves from 170° to 30°. How many degrees does it turn?
10. 10.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
11. 11.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
24. 24.🦾 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 left (b) points right (c) points up and right (d) points left
25. 25.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
26. 26.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
30. 30.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.True or false: “reverses if wires swap” 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 135°. Where does the arm point? (a) points up and left (b) points left (c) points straight up (d) points up and right
36. 36.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
37. 37.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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