Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 23 · 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 130° to 120°. How many degrees does it turn?
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
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 up and left (c) points straight up (d) points right
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
6. 6.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
7. 7.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
9. 9.⚙️ 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
10. 10.🦾 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 right (b) points up and left (c) points up and right (d) points straight up
11. 11.🦾 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 left (d) points straight up
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
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 up and right (b) points left (c) points up and left (d) points right
24. 24.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
25. 25.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle − 10
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
32. 32.🦾 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 left (c) points right (d) points straight up
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
34. 34.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
37. 37.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 50
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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