Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 164 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.🦾 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 up and right (b) points right (c) points up and left (d) points left
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
11. 11.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
12. 12.🦾 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 left (c) points up and right (d) points left
13. 13.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
20. 20.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle − 40
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
24. 24.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
32. 32.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 40
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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