PHOTOSYNTHESIS AND RESPIRATION QUIZ

Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is

31.25 mA

135 mA

15 mA

60 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is

12 W

0.3 W

1.2 W

4.8 W

TRUE ANSWER : ?
YOUR ANSWER : ?

A sudden increase in the total current into a parallel circuit may indicate

an increase in source voltage

a drop in source voltage

an open resistor

either a drop in source voltage or an open resistor

TRUE ANSWER : ?
YOUR ANSWER : ?

In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is

48 mA

12 mA

0 A

3 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately

137 mA

1.8 A

9.09 A

2.2 A

TRUE ANSWER : ?
YOUR ANSWER : ?

Six resistors are in parallel. The two lowest-value resistors are both 1.2 k. The total resistance

is less than 600

is less than 1.2 k

is greater than 1.2 k

is less than 6 k

TRUE ANSWER : ?
YOUR ANSWER : ?

The total resistance of a parallel circuit is 50 . If the total current is 120 mA, the current through the 270 resistor that makes up part of the parallel circuit is approximately

50 mA

22 mA

220 mA

120 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

When an additional resistor is connected across an existing parallel circuit, the total resistance

decreases by the value of the added resistor

remains the same

decreases

increases by the value of the added resistor

TRUE ANSWER : ?
YOUR ANSWER : ?

If one of the resistors in a parallel circuit is removed, the total resistance

decreases

remains the same

increases

doubles

TRUE ANSWER : ?
YOUR ANSWER : ?

The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

7 A

1 A

unknown

the larger of the two

TRUE ANSWER : ?
YOUR ANSWER : ?

↑