Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 928 · 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 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 up and left (d) points straight up
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (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) False (b) True
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
13. 13.⚙️ 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
14. 14.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
15. 15.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
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 left (b) points up and left (c) points straight up (d) points up and right
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 60
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
34. 34.🦾 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 up and right (c) points straight up (d) points left
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
40. 40.🦾 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 left (c) points up and left (d) points right

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