Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 32 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
2. 2.🦾 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 right (c) points left (d) points straight up
3. 3.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
4. 4.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
6. 6.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
7. 7.🦾 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 left (b) points up and left (c) points straight up (d) points right
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
14. 14.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.🦾 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 right (d) points left
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
23. 23.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins round and round” is true of a DC motor. (a) False (b) True

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