Download Part 2: Listing

Electricity Review Sheet
Part 1: Definitions
1. electrical circuit – the closed path through which electric current flows
2. current – the flow of electrons
3. series circuit – a circuit with only one path for the current to flow through
4. parallel circuit – a circuit with more than one path for the current to flow through
5. electrical conductor – a material that allows the flow of electric current
6. electrical insulator – a material that does not allow the flow of electric current
7. static electricity – the net accumulation of electric charge on an object
8. resistance – the tendency of a material to resist the flow of electrons
Part 2: Listing
9. List 3 examples of good conductors. Copper, Iron, Saltwater
10. List 3 examples of good insulators. Plastic, Wood, Air
Part 3: Fill in the Blank
11. Give the unit used to measure the following:
a. voltage __volts__
b. current __amps__
c. resistance __Ohms__
d. power __Watts or Kilowatts__
12. Power lines use _alternating_ current because the current flows in different directions
13. Batteries use __direct__ current because the current flows in one direction.
Part 3: Circuit Diagrams
14. Label the following circuit diagram parts:
a.
b.
RESISTOR
POWER SOURCE
c.
OPEN SWITCH
15. Draw a series circuit with 2 light bulbs, 3 resistors and a power source.
16. Draw a parallel circuit with 1 light bulb on a branch, 1 resistor on another branch and
a power source.
Part 4: Calculations
V=IxR
P=IxV
E=Pxt
17. What is the current flowing through a wire with a 3 ohm resistor and a 6 volt battery?
I=V
I=6
I = 2 amps
R
3
18. Calculate the voltage across a 2 ohm resistor with 4 amps of current.
V=IxR
V=4x2
V = 8 volts
19. How much power does a lamp use if the current is 2 amps and the voltage is 120
volts?
P=IxV
P = 2 x 120
P = 240 Watts
20. A microwave uses 1200 watts of power. If the outlet supplies 120 volts, what is the
current?
I=P
I = 1200
I = 10 amps
V
120
21. A television uses 2400 watts of power and 20 amps of current. What is the voltage of
the outlet?
V=P
V = 2400
V = 120 volts
I
20
22. How much energy does a 1.5 kilowatt hairdryer use if it is on for 0.1 hours?
E=Pxt
E = 1.5 x .1
E = 0.15 kwh
23. How long is a 0.05 kilowatt light bulb on if it uses 6 kwh of energy?
t=E
t= 6
t = 120 hours
P
0.05