Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 224 · 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.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
3. 3.⚙️ 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
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
6. 6.🦾 A servo program runs:
   angle = 70
   angle = angle − 20
   angle = angle + 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 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
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
9. 9.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
10. 10.🦾 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 right (c) points straight up (d) points up and left
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
17. 17.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
22. 22.🦾 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 right (b) points left (c) points up and left (d) points straight up
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (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 DC motor (c) a buzzer (d) a servo motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 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 right (c) points up and left (d) points straight up
31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 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 right (c) points up and left (d) points straight up
34. 34.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
35. 35.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 80° to 90°. How many degrees does it turn?

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