Circuits With Capacitors

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

• 1.6 A going in

• 1.6 A going out

• 6.8 A going in

• 6.8 A going out

For the circuit shown, the resistances are R₁ > R₂ > R_3. What is true about the current through each resistor?

• I₁ = I₂ = I₃

• I₁ > I₂ > I₃

• I₁ > I₃ > I₂

• I₁ < I₃ < I₂

Given the direction of the current shown. Which side of the resistor has the high electric potential energy?

• left side is higher

• right side is higher

Which side of the battery has the higher electric potential energy?

• right side is higher

• left side is higher

Tags

NGSS.HS-PS3-1

The nano-sized tractor moves a charge across the resistor with the shown current. Will the charge gain or lose energy?

• + ΔV

• - ΔV

• varying potential difference

• Can't tell from the given information.

Four capacitors are connected in a circuit as shown below. If the voltage across the battery is 30V, then:

a) what is the total charge flowing through the circuit?

b) what is the charge flowing through the first capacitor on the left? (Think about the rules used in series and parallel circuits for charge)

• a) 200 Micro Coulombs

  b) 200 Micro Coulombs

• a) 66.7 Micro Coulombs

  b) 66.7 Micro Coulombs

• a) 200 Micro Coulombs

  b) 66.7 Micro Coulombs

• a) 66.7 Micro Coulombs

  b) 200 Micro Coulombs

Three capacitors of capacitances 3μF, 9 μF and

18 μF are first connected in series and then in parallel. The ratio of the net capacitances in series to that in parallel is _____.

• 1:1

• 1:3

• 1:15

• 3:1

• 15:1

Tags

NGSS.HS-PS3-2

Which of the following equations is/are a consequence of Kirchhoff’s rules, when applied to the figure below.

• I only

• II only

• III only

• I and II only

• II and III only

Which of the following equations represent the current I in the circuit?

• 
• 
• 
• 
• 

If the capacitance is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:

• 846×10^-6Joule
• 7.23×10^-3 Joule
• 6.76×10^-5Joule
• 5.94×10^-2Joule

Tags

NGSS.HS-PS3-1