Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 344 · 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 motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
2. 2.🦾 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 straight up (c) points up and left (d) points left
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 120
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
12. 12.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
13. 13.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
17. 17.🦾 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 left (b) points up and left (c) points up and right (d) points right
18. 18.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
32. 32.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
33. 33.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
36. 36.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
37. 37.⚙️ 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
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 10
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 120° to 140°. How many degrees does it turn?

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