Advertisements
Advertisements
प्रश्न
Find the equivalent resistance between A and B
Advertisements
उत्तर
6Ω and 3Ω are in parallel
`:.1/R_p= 1/R_1 + 1/R_2`
`:.R_(P_1) = 6.3/(6+3) = 18/9` = 2 Ω
4Ω and 2Ω are in parallel
`:. 1/R_P = 1/R_1 + 1/R_2`
`:. R_(P_2) = 4.12/(4+12) = 4.12/16 = 3 Ω`
`:. "Total" R_T = R_(P_1) + R_(P_2) = 2 + 3 = 5 Ω`
APPEARS IN
संबंधित प्रश्न
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
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.
How does the resistance of a wire change when:
its length is tripled?
How does the resistance of a wire change when:
its diameter is tripled?
Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
How will you oonnect five resistors, each of the value one ohm, to obtain an equivalent resistance of 0.2 `Omega`
How does the resistance of an alloy, vary with temperature?
State and explain the laws of resistance.
The resistance of the hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use?
