Deck 6: Parallel Circuits

Question 1

In a ____________________ circuit, all the lights on a circuit would have to be on in order for any one light to operate.

Answer 1

series

Question 2

If four resistors, each with a value of 100 ohms, are connected in parallel, the total resistance of the circuit is ____ ohms.

A) 400
B) 100
C) 50
D) 25

Answer 2

D

Question 3

The total resistance of a ____ circuit is always less than the resistance of the lowest value resistor in the circuit.

A) combination
B) parallel
C) series

Answer 3

B

Question 4

In parallel circuits, the voltage across each branch of the circuit is ____.

A) dependent on the value of the branch resistor
B) dependent on the total current
C) always equal
D) none of the above

Question 5

In a parallel circuit,the amount of current flowing through each resistor is inversely proportional to its ____.

A) amperage
B) current
C) resistance
D) wattage

Question 6

____________________ circuits are circuits that have more than one path for current flow.

Question 7

____________________ circuits are probably the type of circuit with which most people are familiar, such as when working with lights and receptacles in homes and office buildings.

Question 8

Three resistors, with values of 10 ohms, 20 ohms, and 30 ohms, are connected in parallel and the circuit has a voltage of 120 volts with an amperage of 2.5 amps. The total current of the 20-ohm branch is ____ amps.

A) 2.5
B) 6
C) 50
D) 60

Question 9

If a parallel circuit has two resistors with values of 10 ohms and 25 ohms, the total resistance of the circuit is ____ ohms.

A) 250
B) 35
C) 7.14
D) .14

Question 10

The ____ across any branch of a parallel circuit is the same as the applied voltage.

A) amperage
B) resistance
C) voltage drop
D) wattage

Question 11

According to Ohm's law, an increase of resistance must cause a proportional decrease of ____.

A) voltage
B) wattage
C) resistance
D) current

Question 12

The reciprocal of any number is that number divided ____.

A) by 1
B) into 1
C) into 10
D) by 10

Question 13

The total amount of power in a ____ circuit is equal to the sum of the power used by all the parts.

A) series
B) parallel
C) combination
D) any of the above

Question 14

____ is the amount of power a circuit is supplying to an electrical device.

A) Amperage
B) Load
C) Resistance
D) Voltage

Question 15

In parallel circuits, when all resistors are of equal value the total resistance is equal to the value of one individual resistor ____.

A) multiplied by the number of resistors
B) divided by the number of resistors
C) multiplied by the voltage
D) divided by the voltage

Question 16

When using the product over sum method of determining the total resistance of a parallel circuit, you would ____.

A) multiply the total of R(1) times R(2) by the total of R(1) plus R(2)
B) multiply the total of R(1) plus (R2) by the total of R(1) times R(2)
C) divide the total of R(1) times R(2) by the total of R(1) plus R(2)
D) divide the total of R(1) plus R(2) by the total of R(1) times R(2)

Question 17

A ____ circuit is the conductors that supply power to electrical equipment from the last overcurrent protective device (fuse or circuit breaker).

A) branch
B) feeder
C) parallel
D) series

Question 18

In a ____________________ circuit, if one light were to burn out, all the lights on the entire circuit would go out.

Question 19

The total ____________________ flow in a parallel circuit is equal to the sum of the currents through all of the branches of the circuit.

Question 20

The amount of current leaving the source ____.

A) is always less than the current returning to the source
B) is always more than the current returning to the source
C) must equal the current returning to the source
D) varies with the value of the resistance in the circuit

Question 21

The total resistance of a ____________________ circuit is the reciprocal of the sum of the reciprocals of the individual branches.

Question 22

A parallel circuit has three resistors rated at 20 ohms, 40 ohms, and 40 ohms. The total resistance of this circuit is ____________________ ohms.

Question 23

When dealing with the concept of load, many students incorrectly believe that an increase of ____________________ results in an increase of load.