Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 984 · 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 turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
2. 2.🦾 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 up and left (b) points straight up (c) points up and right (d) points right
3. 3.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
6. 6.⚙️ 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
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
8. 8.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 10
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 80° to 50°. How many degrees does it turn?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
24. 24.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🦾 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 up and right (b) points straight up (c) points up and left (d) points left
27. 27.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle − 50
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 50
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 30
    angle = angle + 50
    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) False (b) True
35. 35.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
36. 36.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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