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?
Advertisements
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
Find the equivalent resistance between 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
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
Give one example to show how the resistance depends on the nature of material of the conductor.
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
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
How does the resistivity of a semiconductor depend on temperature?
State and explain the laws of resistance.
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.
With the help of a circuit diagram derive the formula for the resultant resistance of three resistances connected:
- in series and
- in parallel
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
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 ______.
