Robotics Worksheet: DC and Servo Motors

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

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