Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 521 · 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.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
2. 2.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
7. 7.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
8. 8.🦾 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 right (b) points up and left (c) points up and right (d) points left
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 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 right (d) points straight up
20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
25. 25.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 40
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle − 40
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle − 10
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.⚙️ 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
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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