Advertisements
Advertisements
प्रश्न
Find the equivalent resistance between points A and B
Advertisements
उत्तर
As shown in the circuit diagram all the 3Ω resistors re connected in parallel.
`1/R_1=1/3+1/3+1/3`
`R_1=1Omega`
Resistors 4Ω and 6Ω are connected in parallel.
`1/R_2=1/4+1/6=5/12`
`R_2=12/5Omega`
Now R1, R2 and 5Ω are connected in series
`R_(AB)=1+12/5+5`
`R_(AB)=42/5`
`R_(AB)=8.4Omega`
APPEARS IN
संबंधित प्रश्न
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
Two resistors of 4Ω and 6 Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
(i) Draw a labelled circuit diagram showing the above arrangement.
(ii) Calculate the current in each resistor. What is an Ohmic resistor?
How does the resistance of a wire change when:
its diameter is tripled?
Give the law of combination of resistances in series.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.
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 value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
With the help of a circuit diagram derive the formula for the resultant resistance of three resistances connected:
- in series and
- in parallel
