Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 235 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
7. 7.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
8. 8.⚙️ 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
9. 9.🦾 A servo program runs:
   angle = 180
   angle = angle − 20
   angle = angle + 20
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.🦾 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 right (b) points up and left (c) points up and right (d) points left
13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 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 up and left (c) points up and right (d) points straight up
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.🦾 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 straight up (c) points left (d) points right
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
28. 28.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
29. 29.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
32. 32.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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