Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 208 · 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 holds a set angle? (a) a DC motor (b) a servo motor
2. 2.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
7. 7.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
10. 10.🦾 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 right (c) points up and left (d) points right
11. 11.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
14. 14.🦾 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 right (b) points straight up (c) points left (d) points up and left
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 straight up (d) points up and right
19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
24. 24.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
29. 29.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
35. 35.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
36. 36.🦾 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 up and left (c) points right (d) points left
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 70° to 180°. How many degrees does it turn?

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