Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 209 · 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: “reverses if wires swap” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
6. 6.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
9. 9.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
10. 10.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
12. 12.🦾 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 left (c) points right (d) points up and left
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
15. 15.🦾 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 right (b) points up and left (c) points right (d) points straight up
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.🦾 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 right (c) points straight up (d) points up and right
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
39. 39.🦾 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 straight up (c) points left (d) points right
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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