Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 693 · 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) 18° (b) 180° (c) 1800° (d) 10°
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo program runs:
   angle = 180
   angle = angle − 10
   angle = angle − 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo program runs:
   angle = 120
   angle = angle − 10
   angle = angle − 50
   angle = angle + 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
11. 11.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
13. 13.🦾 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 right (b) points straight up (c) points left (d) points right
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 30
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
19. 19.⚙️ 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
20. 20.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
21. 21.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
23. 23.⚙️ 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
24. 24.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 30
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
27. 27.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 30
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 up and right (b) points straight up (c) points up and left (d) points right
30. 30.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.🦾 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 up and right (b) points right (c) points left (d) points straight up
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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