Some More Questions About Resistors

1Q: What is meant by series combination of resistors?

Ans: A combination of two or more than two resistors which has one and only one path for the conduction of current is called series combination of resistors.

2Q: What is the total resistance of a series circuit?

Ans: Total Resistance, R_T = R₁ + R₂ + R₃ + - - - - - -       

Where, R₁, R₂ and R₃ are the resistances of the three resistors.

3Q: Does the magnitude of current remain the same through each series component?

Ans: Yes, I_T = I₁ = I₂ = I₃ = - - - - -

Where, I₁, I₂, and I₃ are the magnitudes of currents passing through R₁, R₂ and R₃, respectively.

4Q: What is the voltage formula for a series circuit?

Ans: Total voltage, V_T = V₁ + V₂ + V₃ + - - - - -

Where, V₁, V₂ and V₃ are the magnitudes of voltage drops across R₁, R₂ and R₃ respectively.

5Q: What is meant by a parallel combination of resistors?

Ans: A combination of two or more than two resistors in which all the resistors are connected across a single source of supply is called a parallel

 combination of resistors.

6Q: What is the total resistance of a parallel circuit?

Ans: Total resistance, 1/R_T = 1/R₁ + 1/R₂ + 1/R₃ + - - - - -

7Q: Does the voltage across each parallel component remain the same?

Ans: Yes, V_T = V₁ = V₂ = V₃ = - - - - -

8Q: Does the current through each parallel component remain the same?

Ans: No, I_T = I₁ + I₂ + I₃ + - - - - -

9Q: What is meant by a compound circuit?

Ans: A combination of series and parallel circuits is called a compound circuit.

10Q: What is meant by a parallel-series circuit?

Ans: If a few parallel combination of resistors are connected in series then they form a parallel-series circuit.

11Q: What is meant by a series-parallel circuit?

Ans:  If a few series combination of resistors are connected in parallel then they form a series-parallel circuit.

12Q: What will be the total resistance of 3-4 identical resistors when connected in series?

Ans: R_T = n.R

Where, n = Number of resistors.

R = Resistance of one resistor.

13Q: What will be the total resistance of 3-4 identical resistors when connected in parallel?

Ans: R_T = R/n

14Q: What is the formula for determining the total power consumption of a circuit?

Ans: Total power consumption of a series or a parallel circuit is determined by:

 P_T = P₁ + P₂ + P₃ + - - - - -

Where, P₁, P₂ and P₃ are the power consumption of the resistors R₁, R₂ and R₃ respectively.

15Q: What are Kirchhoff’s law?

Ans: (1) The sum of the currents flowing towards a junction is equal to sum of the current flowing away from the junction.

∑ I = 0.

(2) Round any closed loop of an electric circuit, the algebraic sum of the e.m.fs. acting in the loop is equal to the algebraic sum of the voltage drops.

∑ E = ∑ I.R

Where, ∑ = Algebraic sum

I = Current

R = Resistance reference

16Q: What is Wheat Stone Bridge?

Ans: An arrangement of 4 resistors designed by Mr. Wheat Stone is called the Wheat Stone Bridge.

17Q: What is Wheat Stone Bridge’s formula?

Ans: P/Q = R/S

Where, P/Q = Ratio arm resistance, ohms

R = The resistance whose value is so adjusted that no current flows through the galvanometer, ohms

Q = Unknown resistance, ohms.

18Q: What is the application of Wheat Stone Bridge?

Ans: The circuit is used in ‘Post Office Box’ and ‘Temperature Bridge’ instruments for the determination of value of an unknown resistor.

19Q: What is meant by a gang resistor?

Ans: A multiunit resistor is known as a gang resistor also.

20Q: What will happen if the cross-sectional area of a conductor is doubled and its length is haived?

Ans: The resistance of the new sized conductor will remain only one-fourth of its old value.

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