Ch 41 Series Parallel Circuits

The amperage in a series circuit _______.

• is the same anywhere in the circuit

• varies in the circuit due to the different resistances

• is always less returning than leaving the battery

• is high at the beginning of the circuit and decreases as the current flows through the resistance

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?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

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?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

Calculate the total resistance and current in a 12 volt parallel circuit with three resistors of 4 ohms, 8 ohms, and 16 ohms, using any one of the five methods (calculator suggested). What is the total resistance and current?

• 4 ohms (3.0 amperes)

• 28 ohms (0.4 amperes)

• 2.3 ohms (5.3 amperes)

• 14 ohms (0.8 amperes)

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 fuse to blow (open). Technician B says that it would decrease the current in the circuit. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

A vehicle has resistances to control the blower motor speed. This is an example of a _______ electrical circuit.

• series

• redundant

• series-parallel

• double

Two light bulbs are wired in series and one bulb burns out (opens.) Technician A says that the other bulb will still work. Technician B says that the current will increase in the circuit because one electrical load (resistance) is no longer operating. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

In a series circuit, total circuit resistance is equal to the ________ of the resistance of all loads in the circuit.

• dividend

• sum

• difference

• None of these

A series circuit has two 10-ohm bulbs. A third 10-ohm 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?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

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?

• 1 amp

• 4 amp

• 2 amp

• 3 amp