Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 204 · 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 DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.🦾 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 straight up (c) points right (d) points up and right
9. 9.⚙️ 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
10. 10.⚙️ 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
11. 11.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
14. 14.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
18. 18.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle + 20
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
22. 22.⚙️ 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
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
33. 33.🦾 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 left (c) points right (d) points up and left
34. 34.🦾 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 straight up (c) points up and left (d) points left
35. 35.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
37. 37.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
38. 38.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 60
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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