Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 848 · 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 light sensor (b) a buzzer (c) a DC motor (d) a servo motor
2. 2.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
15. 15.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo 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 holds a set angle? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 10
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 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 straight up (c) points left (d) points up and right
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
28. 28.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
31. 31.🦾 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 left (b) points right (c) points up and left (d) points up and right
32. 32.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle − 60
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 130° to 160°. How many degrees does it turn?
37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 170° to 120°. How many degrees does it turn?
40. 40.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it

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