Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 85 · 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) light (c) movement (d) sound only
2. 2.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.🦾 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 right (b) points straight up (c) points left (d) points right
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
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 straight up (c) points left (d) points up and left
11. 11.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.🦾 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 up and right (c) points straight up (d) points left
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 10
    angle = angle − 50
    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 50° to 40°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
33. 33.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 10
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 50
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
38. 38.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 50
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor

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