Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 196 · 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 drives the wheels? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle + 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
4. 4.🦾 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 right (b) points left (c) points straight up (d) points up and left
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
8. 8.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
9. 9.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
11. 11.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
12. 12.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.⚙️ 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
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.⚙️ 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
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
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 up and left (b) points up and right (c) points left (d) points straight up
19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
22. 22.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
30. 30.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
31. 31.🦾 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 left (c) points straight up (d) points up and right
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 30
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle − 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 60° to 80°. How many degrees does it turn?

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