Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 926 · 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 90°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and right
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
4. 4.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
8. 8.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
10. 10.🦾 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 up and left (c) points right (d) points left
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
14. 14.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🦾 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 straight up (b) points up and left (c) points right (d) points up and right
19. 19.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
21. 21.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
22. 22.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
23. 23.🦾 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 left (c) points right (d) points up and right
24. 24.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
36. 36.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 60
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 20
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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