Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 309 · 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.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
2. 2.🦾 A servo program runs:
   angle = 140
   angle = angle − 10
   angle = angle + 20
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (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 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points straight up (d) points right
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
10. 10.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 60
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo moves from 150° to 140°. How many degrees does it turn?
23. 23.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 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 right (c) points left (d) points straight up
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 60
    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 right (b) points left (c) points up and right (d) points up and left
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
39. 39.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False

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