Practice Problems for the Electric Circuit Models
 A list of terms to define  Term list with definitions
Circuit Equations

 Problem 1:

a. Find the current in this circuit:

b. How much power is delivered to the resistor?

 

Problem 1 Solution


Problem 2: Use the two circuits shown to fill in the table below.

 Total resistance:

 

Total resistance:

 For each circuit element find:  A  B  C  D  E
 current          
 voltage drop          
 power          

Problem 2 Solution


Problem 3: Use the two circuits shown to fill in the table below.

 

Total resistance:

 

Total resistance:

 For each circuit element find:  A  B  C  D  E
 current          
 voltage drop          
 power          

Problem 3 Solution


Problem 4: Which electric device has more resistance? Explain your reasoning.

Problem 4 Solution


 Problem 5: In the lab you take a resistor and connect it to a variable voltage source. Recording voltage and current, your data table looks like this:

When a graph of V vs. I is made, what is the value and interpretation of the slope?

 V (Volts)  I (Amperes)
   5  0.1
 10  0.2
 15  0.3
 20  0.4

Problem 5 Solution


Problem 6: Power is equal to current times voltage, so power lines could be high voltage or high current and still transfer power. Why do we always use high voltage? (Hint: Substitue Ohm's law into the power equation.)

Problem 6 Solution