Electrical Energy, Capacitance and Kirchoff's Law

What is voltage?

• The amount of electric potential energy per one coulomb of charge
• The amount of 1 coulomb of charge per unit of potential energy
• The number of volts per coulomb
• The amount of electric potential energy per volt

The difference in electrical potential energy between two places is called …………...

• resistance

• friction

• induction

• voltage

At which point is the electric field the weakest?

• A because it is the furthest away
• A because the field lines are further apart
• C because the field lines are further apart
• C  because it is the furthest away

Tags

NGSS.HS-PS2-4

Two, point charges 𝑞₁ = +5.00 𝑛𝐶 and 𝑞₂ = − 3.00 𝑛𝐶 are separated by 35.0 cm.

What is the potential energy of the pair of charges?

• -3.85 X 10^-7 J

• +3.85 X 10^-7 J

• +1.29 x 10² J

• -7.71 x 10¹ J

Three charges are placed at the corners of an equilateral triangle of side 2.00 𝑚𝑚 as shown below. Calculate the electric potential energy associated with this configuration.

• 8.9 x 10^-4 J

• 4.5 x 10^-4 J

• 8.9 x 10^-6 J

• 2.7 x 10^-4 J

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

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?

• 
• 
• 
• 
• 

Consider the circuit shown in the figure below.

a) Apply Kirchhoff’s law to 𝑙𝑜𝑜𝑝 1 to find the current 𝑖₁.

b) Apply Kirchhoff’s law to 𝑙𝑜𝑜𝑝 2 to find the current 𝑖₂.

c) Find the current i₃.

• a) i₁ = -1/2A

  b) i₂ = -1/3A

  c) i₃ = -5/6 A

• a) i₁ = -3/2A

  b) i₂ = -1/3A

  c) i₃ = -5/6 A

• a) i₁ = -1/2A

  b) i₂ = -1/3A

  c) i₃ = -1/6 A

• a) i₁ = -1/3A

  b) i₂ = -1/2A

  c) i₃ = -5/6 A