Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 742 · 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 program runs:
   angle = 20
   angle = angle + 40
   angle = angle + 60
   angle = angle + 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
3. 3.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.🦾 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 up and left (c) points up and right (d) points left
9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 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 right (b) points straight up (c) points up and left (d) points left
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
17. 17.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
20. 20.🦾 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 left (d) points straight up
21. 21.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 20
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a servo 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.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False

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