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
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 points A and B.
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
Name the material which is the best conductor of electricity.
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.
Give the law of combination of resistances in series.
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
Choose the correct option from given alternative:
Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1A. The current through the 40W bulb will be:
Two resistors having 2Ω and 3Ω resistance are connected—(i) in series, and (ii) in parallel. Find the equivalent resistance in each case.
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.
