Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 874 · 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 servo moves from 120° to 150°. How many degrees does it turn?
2. 2.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
3. 3.🦾 A servo program runs:
   angle = 100
   angle = angle − 30
   angle = angle − 20
   angle = angle − 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 10
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
25. 25.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
27. 27.🦾 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 straight up (c) points left (d) points up and right
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
34. 34.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 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 left (c) points right (d) points up and left
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor

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