Series and Parallel

Series and Parallel Recap!

Multiple Choice

Does this diagram represent a series or parallel circuit?

• series circuit

• parallel circuit

Multiple Choice

The picture shows an electrical circuit. This circuit is a series circuit because:

• It has 3 light bulbs.

• The same current flows through all three light bulbs.

• It uses a single battery.

• The electrical current is divided between the three light bulbs.

Multiple Choice

If the current at P1 is 3.0 A, what is the current at P3?

• 0.0 A

• 1.0 A

• 2.0 A

• 3.0 A

Recap (Series)

• Current = Same at ALL points in the SERIES circuit

Multiple Choice

If each of the light bulbs has a potential difference of 2.0 V, what is the emf of the battery?

• 2.0 V

• 4.0 V

• 6.0 V

• 12.0 V

Recap (Series)

• Total Voltage = Sum of individual potential Difference in SERIES circuit

• (e.g. 5V = 2V + 3V)

Multiple Choice

What is the total resistance of the circuit?

• 100 ohms

• 450 ohms

• 400 ohms

• 30 ohms

Recap (SERIES)

• Current = Same at all points in the circuit

• Total Voltage = Sum of individual potential Difference (e.g. 5V = 2V + 3V)

• Resistance = Sum of Resistance in the circuit (5 Ohm = 2 Ohm + 3 Ohm

Recap (PARALLEL)

• Current = Splits at "traffic junctions" (5A = 2A + 3A)

• Emf of battery = Potential Difference of "branch" (e.g. 3V = 3V)

• (1 / Total Resistance) = (1 / R1) + (1 / R2)

Multiple Choice

In a parallel circuit, which of the following is the same value throughout the circuit?

• Voltage

• Current

• Resistance

• Charge

Multiple Choice

Which of the following is true of the circuit when switch S is open?

• no current will flow in the circuit

• current will flow through both R1 and R2

• current will flow through only R1

• current will flow through only R2

Multiple Choice

Two identical lamps, L1 & L2, are connected to a constant voltage power supply. The potential difference across L1 is 36 V.

What is the electromotive force (e.m.f.) of the power supply?

• 18 V

• 36 V

• 6 V

• 72 V

Multiple Choice

The total resistance of this circuit is __________.

• 25.7 Ω

• 315 Ω

• 324 Ω

• 90 Ω

Multiple Choice

The current going through the 45 Ω resistor is __________.  (Hint: Use R = V/I as the starting formula)

• 0.05 A 

• 0.2 A 

• 0.1 A 

• 5 A 

Multiple Choice

What is the current measured by ammeter A?

• 0.5 A

• 2 A

• 72 A

• 6 A

Multiple Choice

The total current going through the battery of this circuit is __________. (This qns requires multiple steps!)

• 0.350 A

• 0.0286 A

• 0 A

• 9 A