Advertisements
Advertisements
Question
The diagram below shows part of a circuit:
If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω
Advertisements
Solution
(a) 9 Î
The two resistors of 6 Î are connected in parallel with each other. So, their net resistance 3 Î is connected in series with a resistance of 6 Î. So, the net resistance of the complete arrangement is 9 Ω.
APPEARS IN
RELATED QUESTIONS
Find the equivalent resistance between A and B
How does the resistance of a wire change when:
its diameter is tripled?
Calculate the combined resistance in the given case:
If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :
(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω
State how are the two resistors joined with a battery when same current flows in each resistor.
Choose the correct alternative and rewrite the following sentence.
If three resistors 2 ohms, 3 ohms and 4 ohms are connected in series, then the effective resistance in the circuit will be _______ ohms.
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
How does the resistivity of an alloy such as constantace depends on temperature.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
State expression for Resistance connected in series.
Write an expression for calculating electrical power in terms of current and resistance.
Calculate the equivalent resistance between the points A and B for the following combination of resistors:
Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.
Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.
When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is:
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.
