Chap 6 Parallel Circuits

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?

Tech B

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

2.3 ohms (5.3 amps)

If an accessory such as an additional light is spliced into an existing circuit in parallel, what happens?

The current increases in the circuit.

A 6-cylinder engine uses six fuel injectors connected electrically in two groups of three injectors in parallel. What would be the resistance if the three 12 ohm injectors were connected in parallel?

4 ohms

A vehicle has four taillight bulbs all connected in parallel. If one bulb burns out (opens), what happens to the total current flow in the circuit ______________?

Decreases because only three bulbs are operating

Two identical bulbs are connected to a 12-volt battery in parallel. The voltage drop across the first bulb is 12 volts as measured with a voltmeter. What is the voltage drop across the other bulb?

12 volts

Three resistors are connected to a 12-volt battery in parallel. The current flow through each resistor is 4 amperes. What is the value of the resistors?

3 ohms

Two bulbs are connected to a 12-volt battery in parallel. Another bulb is added in parallel. Technician A says that the third bulb will be dimmer than the other two bulbs due to reduced current flow through the filament of the bulb. Technician B says that the amount of current flowing from the battery will decrease due to the extra load. Which technician is correct?

Neither

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 total current in the circuit. Which technician is correct?

Tech B

Three resistors are connected in parallel to a 12-volt battery. The total current flow from the battery is 12 amperes. The first resistor is 3 ohms and the second resistor is 6 ohms.

2 ohms