Advertisements
Advertisements
प्रश्न
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
उत्तर
When equivalent resistances are connected in series,
R = R1 + R2 + R3 + R4 + R5
R1 = 0.2 Ω, R2 = 0.3 Ω, R3 = 0.4 Ω, R4 = 0.5 Ω, R5 = 12 Ω ....(Given)
R = 0.2 + 0.3 + 0.4 + 0.5 + 12
R = 13.4 Ω
V = IR ....(According to Ohm’s law)
I = `"V"/"R"`
= `9/13.4`
= 0.67 A
There will be no division of electric current because the resistors are connected in series.
0.67 A of electric current will flow in a 12 Ω resistor.
APPEARS IN
संबंधित प्रश्न
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Write any two characteristics of a series combination of resistors.
Name the material which is used for making the heating element of an electric iron.
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
What is the equivalent resistance between A and B in the given circuit (Fig?)
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
How does the resistivity of an alloy such as constantace depends on temperature.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
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 Cells connected in parallel.
Write an expression for calculating electrical power in terms of current and resistance.
Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.
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.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
A metal wire of resistance 6 Ω is stretched so that its length is increased to twice its original length. Calculate its new resistance.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
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:
