Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 531 · 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 has just two wires? (a) a servo motor (b) a DC motor
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
10. 10.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
16. 16.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 20
    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 0°. Where does the arm point? (a) points right (b) points left (c) points straight up (d) points up and left
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.🦾 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 up and right (c) points up and left (d) points left
25. 25.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
27. 27.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 20
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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