Advertisements
Advertisements
Question
Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.
Advertisements
Solution
r1 = r2 = r3 = r4 = 2 Ω
Both r1 and r2 are connected in series in the figure.
Total resistance in series R1 = r1 + r2
= 2 + 2
= 4 Ω
r3 and r4 are in parallel `1/"R" = 1/r_1 + 1/r_2`
= `1/2 + 1/2 = 1`
R2 = 1 Ω
Total resistance R1 + R2 = 4 + 1 = 5 Ω
APPEARS IN
RELATED QUESTIONS
An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 9 Ω.
State the law of combination of resistances in parallel.
In the diagram shown alongside, the cell and the ammeter both have negligible resistance. The resistors are identical.
With the switch K open, the ammeter reads 0.6 A. What will be the ammeter reading when the switch is closed?
A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio `R_1/R_2` is:
(a) `1/25`
(b)1/5
(c)5
(c)25
State how are the two resistors joined with a battery when potential difference is same across each resistor.
A particular resistance wire has a resistance of 3 ohm per meter. Find the total resistance of three lengths of this wire each 1.5 m long, joined in parallel.
A battery of e.m.f. 15 V and internal resistance 2 `Omega` is connected to tvvo resistors of 4 ohm and 6 ohm joined.
(i) In series,
(ii) In para 1 lel. Find in each case the electrica I energy spent per minute in 6 ohm resistor.
Tick (✓) the correct choice among the following :
Consider two cases of two parallel current carrying conductors. Current in
th e same direction and currents in th e opposi te directions will produce
Calculate the current flows through the 10 Ω resistor in the following circuit.
