Department of Natural Sciences
Clayton College & State University
Morrow, Georgia

March 31, 2009

SCI 1901E - Quiz 15

Name __________SOLUTION_____________

(06)     1.         Use the word series or parallel to identify the type of circuit described in the

following phrases.
 

a.         The potential difference across each resistor is equal.

                                        parallel 
 

b.         The current passing through each resistor is the same.

                                        series 
 

c.         If a single load element burns out, no current will flow in the circuit.

                                         series
 

d.         Unless the resistance of each load is equal, the currents through each load are different.

                    parallel
 

e.         Unless the resistance of each load is equal, the potential difference across each load is different.

                                         series
 

f.          Adding additional resistance to the circuit decreases the current.


                                        series

 

(09)     2.         A 150 W light bulb is connected to a 120 V source.
 

a.         Calculate the current in the circuit.

                                        P = 150 W

                                        V = 120 V

                                        P = VI

                                        I = P/V = (150W) / (120V) = 1.25 A 
 

b.         Calculate the resistance of the light bulb.


                                            V = IR

                        R = V/I = (120 V) / (1.25 A) = 96.0 W

 

                                                OR

 

                       P = I2R

                        R = P/I2 = (150W) / (1.25 A)2