Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 845 · 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.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
2. 2.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
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 right (c) points up and right (d) points straight up
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
15. 15.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
26. 26.🦾 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 right (b) points up and left (c) points left (d) points right
27. 27.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 30
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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