Electric Charge
The law of conservation of charge says
charge cannot be created or destroyed but can be transferred
In order to work, a circuit must have what kind of path?
a closed path
What are the two types of circuits we have learned about?
series and parallel
The voltage difference in a graphing calculator is 6 V, and the resistance is 1200 Ω . What is the current through the batteries of the graphing calculator?
Remember, you need to know the unit as well to get points.
0.0005 A
Name an example of a wet cell batter
car battery
What is charging by contact
the transfer of charge between two objects that are touching or rubbing
What is ohm's law?
I = V/R
Which type of circuit has multiple branches?
parallel
What is the formula for Electrical Power?
Power = current x voltage difference
P=IV
The DC in AC/DC adapter stands for what?
Direct current
What is charging by induction
the rearrangement of charge in an object due to the influence of another object nearby
The AC in an AC/DC adapter stands for what?
Alternating current
What is the purpose of a resistor?
To limit current
The current in a clothes dryer is 15 A when it is plugged into a 240 V outlet. What is the power of the clothes dryer?
Remember, you need to know the unit as well to get points.
3,600 W
The tendency of a material to resist the flow of electrons to convert energy is called _______
resistance
What are the two types of electric charge
positive and negative
Which type of of circuit is used in your home, series or parallel?
parallel
What are two types of resistors we use in our homes?
fuse and circuit breaker
What is the formula for Electrical Energy?
Electrical energy = power used x time
E=Pt
Electrical energy is measure in
kWh
kilowatts per hour
An electric charge is surrounded by an electric _________
field
much like water, voltage difference causes charges to ________
flow
Appliances usually have what kind of "rating" on the back?
Power rating
A microwave oven with a power rating of 1,200 W is used for 0.25 h. How much electrical energy did the power company provide for the microwave?
Remember, you need to know the unit as well to get points.
300 kWh
A sock sticks to a towel in a dryer. Are the two objects identically charged of oppositely charged?
oppositely charged