Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 546 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 10
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 10
   angle = angle + 50
   angle = angle − 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
9. 9.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
10. 10.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
12. 12.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
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 right (c) points up and left (d) points straight up
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.🦾 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 straight up (c) points up and right (d) points up and left
25. 25.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
28. 28.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
37. 37.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor

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