Advertisements
Advertisements
प्रश्न
Solve the following question:
In an electric circuit, two resistors of 12 0 each are joined in parallel to a 6 V battery. Find the current drawn from the battery.
Advertisements
उत्तर
Let net resistance of the given parallel combination be Rnet, Then
`1/"R"_"net"=1/12+1/12`
`1/"R"_"net"= 2/12=1/6`
⇒ Rnet = 6 Ω
Hence, current, `"i"="V"/"R"_"net"=(6"V")/(6 Ω)=1"A"`.
संबंधित प्रश्न
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 9 Ω.
A resistor has a resistance of 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
In the circuit given below:
(a) What is the combined resistance?
(b) What is the p.d. across the combined resistor?
(c) What is the p.d. across the 3 Ω resistor?
(d) What is the current in the 3 Ω resistor?
(e) What is the current in the 6 Ω resistor?
Show with the help of diagrams, how you would connect three resistors each of resistance 6 Ω, so that the combination has resistance of (i) 9 Ω (ii) 4 Ω.
A uniform wire with a resistance of 27 Ω is divided into three equal pieces and then they are joined in parallel. Find the equivalent resistance of the parallel combination.
The circuit diagram Fig shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f. 2 V and internal resistance 3 Ω. If main current of 0.25 A flows through the circuit, find:

- the p.d. across the 4 Ω resistor,
- the p.d. across the internal resistance of the cell,
- the p.d. across the R Ω or 2 Ω resistors
- the value of R.
State the S.I. unit of electrical resistance and define it.
A coil in the heater consumes power P on passing current. If it is cut into halves and joined in parallel, it will consume power:
Three resistors of 1 Ω, 2 Ω and 3 Ω are connected in parallel. The combined resistance of the three resistors should be:
You have three resistors of values 2 Ω, 3 Ω, and 5 Ω. How will you join them so that the total resistance is less than 1 Ω? Draw a diagram and find the total resistance.
