Robotics Worksheet: DC and Servo Motors

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

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