Chapter 6, Unit 14-16

A circuit has three 5 ohms resistors connected in parallel. The resistance of this circuit is _________. (a) 1.66 ohms (b) 2.25 ohms (c) 4.76 ohms (d) 5.66 ohms

1.66 ohms (resistance of one resistor/ number of resistors)

The current for a 277V circuit that has three resistors i series where R1 is 10r, R is 10r, and R3 is 10r _________ (a) 4A (b) 7A (c) 9A (d) 12A

10 + 10 + 10 / 277 = 9A

The resistance of a microwave is 15 ohms (R1), and the resistance of an oven is approx. 30 ohms (R2). What is the total resistance of the two appliances if they were connected in parallel? (a) 7.2 ohms (b) 10 ohms (c) 16 ohms (d) 25 ohms

10 ohms (R1 x R2)/(R1 + R2)

The current for a 208V circuit that has three resistors in series where R1 is 1r, R2 is 5r, and R3 is 14r __________ (a) 10.4A (b) 12.7A (c) 12.9A (d) 15.2A

10.4A

A 12V circuit has two 5 resistors connected in parallel. The voltage across any of these resistors is ________. (a) 12V (b) 24V (c) 48V (d) 120V

12V

What is the total resistance of three resistors where R1 is 35r, R2 is 40r, and R3 is 55r? (a) 50r (b) 70r (c) 130r (d) 150r

130

The current for a 120V circuit that has three resistors in a series where R1 is 8r, R2 is 12r, and R3 is 30r is _________ (a) 2.4A (b) 3.7A (c) 4.9A (d) 5.2A

2.4A

A 50r circuit has three resistors in series where R1 is 60V, R2 60V and R3 is 88V. The voltage source is equal to _________. (a) 60V (b) 90V (c) 120V (d) 208V

208V

A 40r circuit has three resistors in series where R1 us 60V, R2 is 60V, and R3 is 120V. The voltage source us equal to _________. (a)60V (b) 90V (c) 120V (d) 240V

240V

A 120V circuit has three resistors in series where R1 is 10r, R2 is 15r, and R3 is 25r. The voltage across R1 is _______ (a) 24V (b) 30V (c) 104V (d) 110V

24V

The resistance of a rice cooker is 5 ohms (R1) and the resistance of an air fryer is approx. 10 ohms (R2). What is the total resistance of the two appliances if they are connected in parallel? (a) 3.33 ohms (b) 5.2 ohms (c) 7.16 ohms (d) 8.29 ohms

3.33 ohms (R1 x R2)/(R1 + R2)

A circuit has three 10A resistors connected in parallel. The current of this circuit is _________. (a) 30A (b) 40A (c) 60A (d) 70A

30A

A 10A circuit has three resistors in series where R1 is 4r, R2 is 4r, and R3 is 4r. The voltage source is equal to _________. (a) 120V (b) 130V (c) 140V (d) 200V

4 + 4 + 4 / 10 = 120V

The resistance of a toaster is 6 ohms (R1) and the resistance of a warming drawer is approx. 12 ohms (R2). What is the. total resistance of the two appliances if they are connected in parallel? (a) 4 ohms (b) 8 ohms (c) 16 ohms (d) 20 ohms

4 ohms (R1 x R2)/(R1 + R2)

A circuit has three 15A resistors connected in parallel. The current of this circuit is __________. (a) 35A (b) 45A (c) 65A (d) 75A

45A

A 120V circuit has three resistors in series where R1 is 10r, R2 is 15r, and R3 is 15r. The voltage across R2 or R3 is ______. (a) 30V (b) 45V (c) 60V (d) 95V

45V

The current for a 240V circuit that has three resistors in series where R1 is 15r, R2 is 20, and R3 is 25r (a) 4A (b) 7A (c) 9A (d) 12A

4A

The total resistance of three 15 resistors connected in parallel is _________. (a) 5 (b) 10 (c) 20 (d) 30

5

The total resistance of ten 50 resistors connected in parallel is __________. (a) 5 (b) 10 (c) 50 (d) 100

5 ohms

The voltage of ten 52.7V solar panels connected in series is _______. (a) 277V (b) 480V (c) 527V (d) 600V

527V

The resistance of a coffee pot is 16 ohms (r!), and the resistance of a skillet is approx. 13 ohms (R2). What is the total resistance of the two appliances if they are connected in parallel? (a) 7.2 ohms (b) 13 ohms (c) 16 ohms (d) 29 ohms

7.2 ohms (R1 x R2)/(R1 + R2)

A 240 circuit has three resistors in series where R1 is 25r, R2 is 25r, and R3 is 30r. The voltage across R1 is _______. (a) 45V (b) 55V (c) 65V (d) 75V

75V

A circuit has three resistors in parallel: 15 ohms, 30 ohms, and 45 ohms. The circuit resistance is ________. (a) 9 ohms (b) 10 ohms (c) 11 ohms (d) 12 ohms

8.2 ohms 1/(1/R1 + 1/R2 + 1/R3)

A 240V circuit has three resistors in parallel where R1 is 25 ohms, R2 is 25 ohms, and R3 is 25 ohms. The resistance of this parallel circuit is ___________. (a) 5.3 ohms (b) 8.33 ohms (c) 13.3 ohms (d) 15.33 ohms

8.33 ohms ( Resistor of one resistors/# of resistors)

A 240V circuit has three resistors in series where R1 is 15r, R2 is 15r, and R3 is 15r. The voltage across R2 or R3 is _________. (a) 50V (b) 65V (c) 80V (d) 90V

80V

A 120V circuit has two 20 resistors connected in parallel. The voltage across any one of these resistors is _______. (a) 12V (b) 24V (c) 48V (d) 120V

No math - answer is the voltage 120V

A parallel circuit has which of the following characteristics? (a) the total circuit resistance is always less than the smallest component (b) current is equal to the sum of the current of all branches (c) voltage is the same across each parallel branch (d) all of these

all of these

A series circuit has which of the following characteristics? (a) circuit resistance is equal to the sum of the resist (b) current is the same through all the resistors (c) The total voltage across all resistors is equal to the voltage source (d) all of these

all of these

The total resistance of a parallel circuit can be calculated by the ________ method. (a) equal reisstance (b) product-over-sum (c) reciprocal (d) any of these

any of these

The total resistance of a parallel circuit can be calculated by using the _________. (a) equal resistance method (b) product over sum (c) reciprocal method (d) any of these

any of these

Series circuits are often used for _____ applications (starting and stopping) of electrical equipment. (a) special (b) control (c) special and control (d) none

control

According to Kirchoff's _______ law, the total current of parallel circuit equals the sum of the currents of all the branches. (a) Current (b) voltage (c) resistance (d) power

current

When working with series-parallel circuits, it is best to _________ the circuit so you can see the series components and the parallel branches. (a) draw (b) photograph (c) configure (d) invert

draw

In a parallel circuit, the voltage across each resistance of the circuit is ______ the voltage source. (a) less than (b) equal to (c) greater than (d) less than or greater than

equal

According to the ______ method, when all the resistance of the parallel circuit have the same resistance, divide the resistance of one resistance by the number of resistors in parallel. (a) equal resistance (b) product-over-sum (c) reciprocal (d) none

equal resistance

In a parallel circuit, the total circuit resistance is always ________ the smallest resistance. (a) greater than (b) less than (c) equal to (d) the square of

less than

Appliances such as heat strips, water heaters, and some types of motors have their internal electrical components connected in ____________. (a) parallel (b) series (c) zig-zag (d) none

parallel

That portion of the series-parallel circuit that contains resistances in ________ must comply with the rules for parallel circuits. (a) series (b) parallel (c) series-parallel (d) parallel-series

parallel

_______ circuits are commonly uses for wiring receptacles, lighting, appliances, and equipment. (a) series (b) parallel (c) multiwire (d) any of these

parallel

When power supplies are connected in parallel, the voltage of the _______ power supplies remains the same. (a) series connected (b) parallel connected (c) multi-connected (d) none

parallel-connected

The _________ method for determining the total resistance of a parallel circuit is used when there are more than two resistors of different values. (a) equal resistance (b) product-over-sum (c) reciprocal (d) none of these

reciprocal

If there is a break in a ______ circuit, the current in the circuit will stop flowing and none of the loads in the circuit will receive voltage. (a) series (b) parallel (c) multiwire (d) any of these

series

That portion of the series-parallel circuit that contains resistances in ______ must comply with the rules for series circuits. (a) series (b) parallel (c) series parallel (d) parallel series

series

The total resistance of a ______ circuit is equal to the sum of the resistances. (a) series (b) parallel (c) series-parallel (d) parallel-series

series

_________ circuits are used for equipment control, signaling, and (at times) the internal wiring of equipment. (a) series (b) parallel (c) multiwire (d) any of these

series

When power supplies are connected in series, the voltage of the________ power supplies is equal to the sum of the power supply voltages. (a) series-connected (b) parallel-connected (c) multi-connected (d) none

series-connected

A _______ circuit is one that contains some resistances in series and some resistances in parallel with each other. (a) parallel (b) series (c) series-parallel (d) none

series-parallel

Series circuits are often used to give a _______ something has occurred. (a) signal that (b) malfunction when (c) signal that or malfunction (d) none

signal that

A series circuit can be envisioned as a circle where current leaves the power source and flows through every load in a ________ path before it returns to the power source. (a) single (b) parallel (c) multiple (d) various

single

In a series circuit, the total circuit resistance is equal to the ________ of all the resistances of all the resistors. (a) sum (b) product (c) square (d) square root

sum

Kirchoff's Voltage Law states that the source voltage of a series circuit is equal to the ________ of the voltage across all circuit resistors. (a) sum (b) product (c) square (d) square root

sum

Kirchhoff's Current Law states that the current flowing through each resistor of a series circuit will be ______ the current leaving and returning to the power source. (a) directly proportional to (b) inversely proportional to (c) added to (d) the same value as

the same value as

The product-Over-Sum method is used to calculate the resistance of _______ parallel resistances of different values. (a) two (b) three (c) four (d) five

two

No matter how many resistances there are in a series circuit, the sum of the voltages across all of the resistances equals the voltage of the source according to the _______ Law of Proportion. (a) voltage (b) current (c) resistance (d) power

voltage

One advantage of parallel circuits is that if one branch of a parallel circuit is opened, ________ is still provided to the other parallel branches. (a) power (b) current (c) resistance (d) voltage

voltage

Receptacles on a circuit are connected in parallel. This results in each receptacle having the same operating ___________. (a) power (b) current (c) resistance (d) voltage

voltage

The voltage across two 24V batteries connected in series is _______. (a) 24V (b) 48V (c) 120V (d) 240V

48V

What is the resistance total of a 16 ohms, a 13 ohms, and a 36ohms resistor connected in parallel? (a) 6 ohms (b) 13 ohms (c) 16 ohms (d) 36 ohms

6 ohms 1 / (1/R1 + 1 / R2 + 1 / R3)

What is the total resistance of three resistors where R1, is 15r, R2 is 20r, and R3 is 35r? (a) 50 (b) 70 (c) 100 (d) 150

70

A circuit has three 25A resistors connected in parallel. The current of this circuit is ________. (a) 35A (b) 45A (c) 65A (d) 75A

75

The internal wiring of many types of equipment, such as motor winding, can be connected in ________. (a) high-mode (b) low-mode (c) zig-zag (d) series

series

If series-connected power supplies are not arranged positive to negative, the circuit _______ will not equal the sum of the power supply voltages. (a) voltage (b) current (c) resistance (d) power

voltage

Lighting is connected in parallel, and each light will have the same operating __________. (a) power (b) current (c) resistance (d) voltage

voltage