Advertisements
Advertisements
Question
The equivalent resistance of a parallel combination of two resistors of 30 Ω and 60 Ω is ______________.
Options
90 Ω
2 Ω
20 Ω
1800 Ω
Solution
The equivalent resistance of a parallel combination of two resistors of 30 Ω and 60 Ω is 20 Ω.
APPEARS IN
RELATED QUESTIONS
Differentiate between resistances in series and parallel.
Complete the following :-
(b)
Complete the following :-
(c)
With a neat labelled diagram and derive the equation for three resistances connected in parallel.
How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of 4 Ω ?
In the circuit given below:
(a) What is the combined resistance?
(b) What is the p.d. across the combined resistor?
(c) What is the p.d. across the 3 Ω resistor?
(d) What is the current in the 3 Ω resistor?
(e) What is the current in the 6 Ω resistor?
A 4 Ω coil and a 2 Ω coil are connected in parallel. What is their combined resistance? A total current of 3 A passes through the coils. What current passes through the 2 Ω coil?
In the diagram shown below, the cell and the ammeter both have negligible resistance. The resistor are identical.
Two resistances when connected in parallel give resultant value of 2 ohm; when connected in series the value becomes 9 ohm. Calculate the value of each resistance.
How will you connect three resistors of resistances 2 Ω, 3 Ω, and 6 Ω to obtain a total resistance of 4 Ω, and 1 Ω?
State how are the two resistors joined with a battery when equivalent resistance is less than either of the two resistances.
Four resistors each of resistance 2Ω are connected in parallel. What is the effective resistance?
Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.
What are the advantages of a parallel connection?
Two resistors of resistance 4 Ω and 6 Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labeled diagram of the arrangement
An electrical appliance has a rating 100 W, 120V. The resistance of element of appliance when in use:
A current of 2 A is passed through a coil of resistance 75 Ω for 2 minutes.
(a) How much heat energy is produced?
(b) How much charge is passed through the resistance?
Calculate the current flows through the 10 Ω resistor in the following circuit.
Two V-I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows (a) series, (b) parallel combination of the resistors.
You have three resistors of values 2 Ω, 3 Ω, and 5 Ω. How will you join them so that the total resistance is less than 1 Ω? Draw a diagram and find the total resistance.
