Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 811 · 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) 18° (c) 1800° (d) 10°
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.🦾 A servo program runs:
   angle = 160
   angle = angle − 20
   angle = angle + 30
   angle = angle − 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
10. 10.🦾 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 right (b) points up and right (c) points straight up (d) points left
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
21. 21.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
22. 22.🦾 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 straight up (c) points up and right (d) points right
23. 23.🦾 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 left (b) points up and right (c) points straight up (d) points up and left
24. 24.🦾 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 up and right (b) points right (c) points up and left (d) points straight up
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC 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 program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 60
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
36. 36.🦾 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 left (b) points right (c) points up and right (d) points straight up
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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