DC Circuits

Electrical appliances are connected in parallel because it

• Is a simple circuit

• Draws less current

• Results in reduced power loss

• Makes the operation of appliances independent of each other

The basic laws for analysing D.C circuit is

• Kirchhoff’s law

• Newtons law

• Fleming’s law

• Faradays law

Kirchhoff’s current law is applicable to only

• Closed loop in a network

• Electronic circuits

• Junction in a network

• Electric circuit.

Kirchhoff’s volage law is concerned with

• IR drops

• Battery e.m.f

• Junction voltages

• Both A and B

Ohm’s law is not applicable to

• Non-linear device

• Linear Device

• Both A and B

• None of the above

The value of permittivity of free space has been calculated experimentally

• 8.85 X 10^12 F/m

• 8.6 X 10^2 F/m

• 8.70 X 10^-12 F/m

• 8.85 X 10^-12 F/m

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

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• 
• 
• 
• 

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

What is the loop rule for the outside loop?

• 8 V - I₃(4) + I₁(1) = 0

• 4 V - I₃(4) + I₁(1) = 0

• 8 V - I₃(4) - I₁(1) = 0

• 4 V - I₃(2) + I₁(1) = 0

For this circuit select the correct statements

• i₁ = 2 A

• i₃ = 8 A

• i₂ = 6 A

• i₂ = i₁ + i₃