Chapter 1 Review OF The DC Machine

1. Voltage (page 2)

a. causes current to flow.

b. must have heavy wire for high voltage.

c. must have current flow to exist.

2. Voltage value determines the thickness of the insulation (page 2).

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3. Heavy copper wire has no resistance (page 2). T_ Fclip_image007

4. Resistance controls the voltage (page 2). T_ Fclip_image009

5. Name two forms of resistance (page 2).

6. Ampere flow is controlled with voltage value and resistance value (pages 2-3). T_ Fclip_image011

7. TWO factors for determining wire size are: the number of amperes and the cooling capability of the device (page 3). T_ Fclip_image013

8. Amperes can be controlled (up or down) without changing the voltage or resistance (pages 2-3). T_ Fclip_image015

9. As its heat increases, copper will have (page 5)

a. more resistance.

b. less resistance.

10. Ohm’s Law proves that, as voltage increases, amperes go up (if the resistance stays the same) (page 5). T_ Fclip_image017

11. A watt is a measurement of power consumed (page 5). T_ Fclip_image019

12. As watts go up, amperes go down (page 6). T_ Fclip_image021

13. The number of watts determines the required wire size (page 6).

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14. Magnetic lines of force go through air and insulation (page 6). T_ Fclip_image025

15. Strength of an electromagnet is controlled by the number of amperes flowing through its coils (page 6). T_ Fclip_image027

16. Polarity of an electromagnet is controlled by the number of amperes flowing through its coils (page 6). T_ Fclip_image029

17. One north pole and one south pole in a six-pole motor equal clip_image031electrical degrees (pages 6-8).

18. A six-pole motor hasclip_image033mechanical degrees (page 8).

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