Term
1. What is the name of the current that flows in one direction? 

Definition


Term
2. What do we call current that flows back and forth? 

Definition


Term
3. What do we call the rate at which energy is transferred by electric current? 

Definition


Term
4. Temperature flows when there is a difference in temperature. Charge flows when there is a difference in ____________ potential. 

Definition


Term
5. What do we call the flow of electric charge? 

Definition


Term
6. What do we call electrons that carry the charge throughout the network? 

Definition


Term
7. Electric current is measured _____ ___________. 

Definition


Term
8. What does the symbol A stand for? 

Definition


Term

Definition
The flow of 1 coulomb/second 


Term
10. What is the unit of charge? 

Definition


Term
11. Does a currentcarrying wire have a net electric charge? 

Definition
No. The number of electrons entering one end is the same number of electrons leaving the other end. 


Term
12. In an electric circuit, what provides the potential difference, voltage source or electric pump? 

Definition
? Dry cells or Wet cells → A battery is two or more cells, these are DC sources Generators – AC source 


Term
13. What is the electric pressure across an average outlet? 

Definition


Term
14. What does 120 volts mean? (I want extremely descriptive units) 

Definition
120 joules/coulomb. So each coulomb has 120 joules of energy 


Term
15. What does 120 joules mean? (I want extremely descriptive units) 

Definition
120 N•m. The force of 120 Newtons is exerted for 1 meter in the direction of flow. 


Term
16. The resistance of a material to the flow of electric current through it is measured in ______________________. 

Definition


Term
17. More or Less. Thick wires have ________ resistance than thin wires. 

Definition


Term
18. More or Less. Longer wires have ________ resistance than shorter wires. 

Definition


Term
19. State Ohm’s Law, and then give me units for each symbol. 

Definition
I=V/R; amperes = volts/ohms 


Term
20. What causes electric shock in the human body – current or voltage. 

Definition


Term
21. Why don’t birds get electrocuted when they land on a highvoltage wire? 

Definition
The whole body is at one voltage. There is no difference in voltage across their body. 


Term
22. What portion of an appliance is connected to the ground wire? 

Definition
Outside surface of appliances are connected to the grounding prong of the plug. 


Term
23. What is the frequency of North American Alternating current? 

Definition
60 Hz, one cycle occurs every 1/60 sec 


Term
24. Name a tiny electronic device that restricts current to flow in a single direction in an electric circuit. 

Definition


Term
25. Do electrons move close to the speed of light when a circuit is completed? 

Definition
No, the electrons do not move as fast as the signal. 


Term
26. The rate at which electrical energy is converted into another form of energy (mechanical, heat, light) is called electric ________________. 

Definition


Term
27. Give me an equation for electric power. 

Definition
. P=IV Power = current x voltage 


Term
28. What are the units of electric power? 

Definition


Term
29. What is the unit of watt? 

Definition


Term
30. In a locality where energy costs 5 cents/kilowatt•hour, how much does it cost to burn a 100 watt light bulb for 24 hours? 

Definition
100 watt •($.05/kilowatt•hour)•(24 hours)•(1 kilowatt/1000watts) = $.12 


Term
31. How much power is used by a calculator that operates on 8 volts and .1 amp? If it is used for 1 hour, how much energy does it use? 

Definition
P = IV = (.1amp)(8 volts) = .8 watts Energy is in kilowatt•hour so Energy = (.8 watts) (1 Hour) = .8 watts • hr = .0008 kilowatts• hour 


Term
32. What current will flow through a 1200 watt appliance operating on a 120 volt line? 

Definition
P = IV, 1200 watts = I (120 Volts); I = 10 amperes 

