Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 156 · 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.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
11. 11.🦾 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 up and left (c) points straight up (d) points right
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
15. 15.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 50
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
29. 29.🦾 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 right (b) points up and left (c) points straight up (d) points right
30. 30.🦾 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 right (c) points straight up (d) points left
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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