Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 340 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
5. 5.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
6. 6.⚙️ 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
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
9. 9.🦾 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 left (c) points up and right (d) points straight up
10. 10.🦾 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 right (d) points straight up
11. 11.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 40
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 170° to 30°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 50
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.🦾 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 right (c) points straight up (d) points left
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
20. 20.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
21. 21.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle − 50
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
31. 31.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
32. 32.🦾 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 right (b) points straight up (c) points up and right (d) points left
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
39. 39.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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