# DC Theory test 1

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1. An invisible force that can produce heat, motion, light, and other physical effects is?
Electricity
2. What convention did benjamin Franklin Suggest
Like objects repel, opposites attract
3. as electrons flow through a conductor, the number of of electrons is measured by the number of coulombs per second that move pass a _____ in a circuit
fixed point
4. The unit of electrical current flow is?
Ampre
5. The coloumb is defined as the total charge of?
6.25 x 10^18 electrons
6. The amount of current flowing through a circuit can be measured with a?
ammeter
7. the thoery of current flow in which current flows from negatve to positive is?
Electron current flow
8. electrical potential of one volt will cause one coulomb of current to do one ____ of work
joule
9. Instrument used to measure Resistance?
Ohmeter
10. Completed path for current to flow from a source of current through a load and back to the source of current?
Circuit
11. when current finds and alternate path back to source, rather than taking path through load, this is called a?
short circuit
12. ohms law states that it takes one volt to push one amp through
one ohm of resistance
13. current flow in an electrical circuit is caused by voltage and opposed by ?
resistance
14. in a circuit current is directly proportional to voltage and _______ proportional to the resistance
iversely
15. the unit of measurment for power is ?
Watts
16. one horse power eqauls to
746 watts
17. power is consumed when voltage is apllied to a circuit and ____ flows through the load.
current
18. The _____ the amount or unit of energy used to measure th amount of heat or work produced or consumed in a system
joule
19. joules law is ?
the total amount of heat produced in a conductor is directly proportional to the resistance times the square of the current.
20. the smallest particle to which an element can be reduced yet still retain the characteristics of a an element
atom
21. 3 main parts of an atom
electrons protons nuetrons
22. nucleus of a atom consist of the
proton and nuetron
23. which particle has a negative charge and rotates around the nuecleus of the atom
electron
24. what keeps orbiting electrons from peing pulled into the nuecleus
centrifical force
25. what is a conductor
a material that allows electric current to flow easily
26. what is a insulator
a material that strongly resist the flow of electricity.
27. how many electrons do semiconductors have in the valence shell
4
28. what are the different ways to make electricity
friction, chemicals, heat, pressure, light, magnetism
29. what determines the individual cell voltage of a battery
the metal being used for the plate.
30. when aluminu and silver are used for a battery what metal will be the negative electrode and why?
aluminum because it will receive more electrons than silver
31. name the two catogories that batteries are divided into
primary cells , secondary cells
32. what type of battery cell can be recharged several times ?
Secondary
33. when two dissimalar metals are joined at a junction and then heated
thermoelectricity
34. a mechanical device designed to allow or interrupt current flow in a circuit
Switch
35. a switch that makes or breaks one circuit path ata time is reffered to as a ?
single pole switch
36. what switches are used to control a light in two locations
three way switches

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 Author: sofamouzgf ID: 114028 Filename: DC Theory test 1 Updated: 2011-11-02 19:56:19 Tags: dc theory first test Folders: Description: first test for d.c. theory Show Answers:

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