Electricity Exam
Formulas: V = IR and P = IV

Answer questions completely and correctly.  Show your work wherever any is required.

What subatomic particle moves through conductors in an electric current?
 

Attract, repel, or nothing
___________ Electron and electron
___________ Neutron and electron
___________ Proton and electron
___________ Proton and proton

Why did the water sometimes bend in its path when a balloon was brought close?
 
 

Give an example of how you could create a static electric charge.
 
 

Give three examples each of
conductors: 1) 2)3)

insulators: 1) 2) 3)

Draw the electric field between two opposite charges.
 
 
 
 

Give an example three of the following (if you answer all four, only the first three will be graded):
an electrochemical cell.

a photoelectric cell.

a thermoelectric cell.

a piezoelectric cell.

In the hose analogy of electricity:
What does the water itself represent?

What do you do to change the current?

What do you do to change the voltage?

Give an example of a technology a semiconductor might be used in.
 

Give an example of a technology a superconductor might be used in.
 
 

Does current run through an open switch or a closed one?
 

Why is it better to have a circuit breaker than a fuse?
 
 

Why is the symbol for a resistor a jagged line?
 
 
 
 

What is the advantage of connecting things in parallel rather than in series?
 
 

Answer the following questions about the schematic below:
 
 
 
 
 

Is this a series circuit or a parallel circuit?
 

If I turned off the switch, how many bulbs would still be lit?

If a 4 V battery is connected to a small light bulb with a resistance of 3.5 Ohms, what will be the current in the bulb?
What are the following variables worth?  (Put a question mark by the variable the problem is asking for.  If a variable is not mentioned, scratch it out.)
I = ________R = ________V = ________P = ________

Which equation should you use?

How should it be rearranged (if at all) to solve for the unknown?

“Plug in” the values and solve it.
 

Final answer: ____________.

What is the current in a bulb that requires 120 V with a power rating of 75 W?
What are the following variables worth?  (Put a question mark by the variable the problem is asking for.  If a variable is not mentioned, scratch it out.)
I = ________R = ________V = ________P = ________

Which equation should you use?

How should it be rearranged (if at all) to solve for the unknown?

“Plug in” the values and solve it.
 

Final answer: ____________.

What is the voltage in a bulb that draws 5 A with a power rating of 75 W?
What are the following variables worth?  (Put a question mark by the variable the problem is asking for.  If a variable is not mentioned, scratch it out.)
I = ________R = ________V = ________P = ________

Which equation should you use?

How should it be rearranged (if at all) to solve for the unknown?

“Plug in” the values and solve it.
 

Final answer: ____________.
 


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