Deck 5: Series, Parallel and Series-Parallel Circuits

Question 1

The amperage in a series circuit is _____________.

A) The same anywhere in the circuit
B) Varies in the circuit due to the different resistances
C) High at the beginning of the circuit and decreases as the current flows through the resistance
D) Always less returning to the battery than leaving the battery

Answer 1

The amperage in a series circuit is same anywhere in the circuit as the same current is flowing through the circuit.
Thus, option
is correct.
Amperage of the circuit depends upon the current flowing through the circuit.
Thus, options (b) and (c) are incorrect.
Amperage of the circuit does not upon the voltage source of the circuit.
Thus, option
is incorrect.

Question 2

What is Kirchhoff's voltage law?

Answer 2

Kirchhoff's voltage law is defined below:
This law is based on the Maxwell equations, which tells us that the voltage drop around any closed loop is equal to the rate-of-change of the flux in the loop.
The amount of flux depends on the area of the loop and also on the strength of the magnetic field. Kirchhoff's voltage law states that the loop voltage is zero.
Mathematically it can be expressed as follows:
Here,
The total number of voltage measured is
.

Question 3

The sum of the voltage drops in a series circuit equals the _____________.

A) Amperage
B) Resistance
C) Source voltage
D) Wattage

Answer 3

The sum of the voltage drops in a series circuit is equal to the source voltage as according to Kirchhoff's voltage law which states that:
Voltage around any closed circuit is equal to the sum of the voltage drops across the resistances.
Mathematically
Kirchhoff's voltage law is determined as follows:
Thus, the correct option is
.
The amperage and the value of the resistance do not affect the voltage drop of the circuit.
Thus, options (a), (b), and (d) are incorrect.

Question 4

What would current (amperes) do if the voltage were doubled in a circuit?

Question 5

If the resistance and the voltage are known, what is the formula for finding the current (amperes)?

A) E = I × R
B) I = E × R
C) R = E × I
D) I = E / R

Question 6

What would current (amperes) do if the resistance in the circuit were doubled?

Question 7

A series circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4 volts. Technician A says that the source voltage is 12 volts. Technician B says that the total resistance is 18 ohms. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 8

What is the formula for voltage drop?

Question 9

If a 12-volt battery is connected to a series circuit with three resistors of 2 ohms, 4 ohms, and 6 ohms, how much current will flow through the circuit?

A) 1 amp
B) 2 amp
C) 3 amp
D) 4 amp

Question 10

Why is the total resistance of a parallel circuit less than the smallest resistance?

Question 11

A series circuit has two 10-ohm bulbs. A third bulb is added in series. Technician A says that the three bulbs will be dimmer than when only two bulbs were in the circuit. Technician B says that the current in the circuit will increase. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 12

Why are parallel circuits (instead of series circuits) used in most automotive applications?

Question 13

Technician A says that the sum of the voltage drops in a series circuit should equal the source voltage. Technician B says that the current (amperes) varies depending on the value of the resistance in a series circuit. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 14

What does Kirchhoff's current law state?

Question 15

Two bulbs are connected in parallel to a 12-volt battery. One bulb has a resistance of 6 ohms and the other bulb has a resistance of 2 ohms. Technician A says that only the 2-ohm bulb will light because all of the current will flow through the path with the least resistance and no current will flow through the 6-ohm bulb. Technician B says that the 6-ohm bulb will be dimmer than the 2-ohm bulb. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 16

What would be the effect of an open circuit in one leg of a parallel portion of a series-parallel circuit?

Question 17

Calculate the total resistance and current in a parallel circuit with three resistors of 4 ?, 8 ?, and 16 ?, using any one of the five methods (calculator suggested). What is the total resistance and current?

A) 27 ohms (0.4 ampere)
B) 14 ohms (0.8 ampere)
C) 4 ohms (3.0 amperes)
D) 2.3 ohms (5.3 amperes)

Question 18

What would be the effect of an open circuit in a series portion of a series-parallel circuit?

Question 19

A vehicle has four parking lights all connected in parallel and one of the bulbs burns out. Technician A says that this could cause the parking light circuit fuse to blow (open). Technician B says that it would decrease the current in the circuit. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B