Advertisements
Advertisements
प्रश्न
Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.
Advertisements
उत्तर
The resistors R2, R3 and R4 in series.
∴ R' = R2 + R3 + R4
= 2 + 3 + 5 = 10 Ω
Now R' and R5 are in parallel.
∴ `1/("R"'') = 1/("R"') + 1/"R"_5`
`= 1/10 + 1/10 = 2/10 = 1/5`
∴ R'' = 5 Ω
Now R1, R” and R6 in series between the points A and B. The equivalent resistance between A and B is
R = R1 + R” + R6 = 2 + 5 + 5 = 12 Ω
संबंधित प्रश्न
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
Find the equivalent resistance between points A and B.
Name the material which is the best conductor of electricity.
How does the resistance of a wire change when:
its length is tripled?
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
Name the material of wire used for making standard resistances. Give a reason.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
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.
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in them is in the ratio:
