Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 84 · 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.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.🦾 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 left (b) points right (c) points up and left (d) points up and right
4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
5. 5.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
6. 6.🦾 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
7. 7.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
9. 9.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle − 50
   angle = angle + 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
14. 14.🦾 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 straight up (b) points up and left (c) points left (d) points up and right
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
16. 16.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.⚙️ 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
22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 10
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
27. 27.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    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 spins round and round? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
35. 35.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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