AP Physics C Electric Circuits

What is the total resistance of the circuit?

• 80 ohms
• 45 ohms
• 50 ohms
• 75 ohms

What is the current through the 45 ohm resistor?

• .067 Amps
• 3 Amps
• .05 Amps
• .67 Amps

A 9.0 V battery and two resistors are connected in a the circuit shown above. The current through the 3.0 Ω resistor is 2.0 A. What is the potential difference across resistor R₂?

• 9.0 V

• 6.0 V

• 3.0 V

• 1.5 V

The above table shows the potential difference and current for each circuit element in a circuit consisting of a battery and three resistors. Which of the following diagrams could represent the circuit?

• 
• 
• 
• 

Select two answers.

• Between points b and e only

• Between points a and f and between points b and c

• Between points b and c and between points c and d

• Between points a and f and between points b and e

A circuit is designed with two resistors, R₁ = 200 Ω and R₂ = 400 Ω, as shown above. What is the relationship between the three labeled currents?

• I₁ + I₂ = I

• I > I₁ > I₂

• I₂ > I₁ > I

• I₁ = I₂ = I

When the circuit shown above is set up, the potential difference across the battery is 3.0 V. By how much will the magnitude of the potential difference across R₂ change when R₃ is removed and its branch is left open?

• The magnitude of the potential difference across R₂ does not change.

• The magnitude of the potential difference across R₂ decreases by 0.5 V.

• The magnitude of the potential difference across R₂ increases by 0.5 V.

• The magnitude of the potential difference across R₂ increases by 1.0 V.

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 has more than one path to flow through

Four identical light bulbs K, L, M, and N, are connected in the circuit above. Which option correctly ranks the current through the bulbs?

• L = M > K = N

• L > M > K > N

• N > K > L = M

• N > L = M > K

Four identical light bulbs K, L, M, and N, are connected in the circuit above. Bulb K burns out. What happens?

• All bulbs will go out.

• Bulb N becomes brighter.

• The brightness of bulb N remains the same.

• Bulb N becomes dimmer but doesn't go out.