Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 81 · 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 motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
6. 6.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
13. 13.🦾 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 left (b) points up and right (c) points right (d) points left
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
15. 15.🦾 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 straight up (c) points up and right (d) points up and left
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
17. 17.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
18. 18.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 right (c) points up and right (d) points up and left

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