Advertisements
Advertisements
Question
What is the equivalent resistance between A and B in the given circuit (Fig?)
Advertisements
Solution
Between A and B, the series combination of two resistors of resistances 2 ohm each is connected in parallel with the 1 ohm resistor.
:. Equivalent series resistance between A and B, R, = 2+2 = 4 Ω
Now, between A and B this 4 Ω resistor is connected in parallel with 1Ω resistor.
Equivalent resistance between A and B, R = `(1/4 + 1/1)^-1= (5/4)^-1 = 4/5`Ω
APPEARS IN
RELATED QUESTIONS
Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.
Name the material which is used for making the heating element of an electric iron.
How does the presence of impurities in a metal affect its resistance?
Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 27 × 10−8 Ωm.
How does the resistance of a wire change when:
its diameter is tripled?
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
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
State expression for Resistance connected in parallel.
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.
Two lamps of resistance 30Ω and 20Ω respectively are connected in series in a 110V circuit. Calculate:
(i) the total resistance in the circuit
(ii) the current in the circuit, and
(iii) the voltage drop across each lamp.
