Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 662 · 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 spins faster with more V? (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 0°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points left
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
4. 4.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
16. 16.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
21. 21.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle − 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
31. 31.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
33. 33.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
35. 35.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 30
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 60
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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