Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 104 · 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 90°?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
3. 3.⚙️ 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
4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
8. 8.🦾 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 up and right (b) points right (c) points straight up (d) points left
9. 9.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 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 left (b) points straight up (c) points left (d) points up and right
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 usually turns 0° to 180°? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo moves from 170° to 120°. How many degrees does it turn?
20. 20.🦾 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 up and left (c) points right (d) points left
21. 21.⚙️ 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
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
23. 23.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
29. 29.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
35. 35.🦾 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 right (d) points up and left
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    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 90°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points right
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
40. 40.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light

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