Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 421 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 30
   angle = angle − 20
   angle = angle + 50
   angle = angle − 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
8. 8.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
9. 9.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
11. 11.🦾 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 left (b) points left (c) points right (d) points up and right
12. 12.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 60
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
29. 29.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle + 40
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor

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